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Year

A year is the orbital period of the Earth moving in its orbit around the Sun. [1]

202 relations: Academic term, Academic year, Accusative case, Afghanistan, Age of the universe, Ancient Greek, Anno Domini, Apsis, Archaeology, Armenian calendar, Astronomical Almanac, Astronomical year numbering, Astronomy, Australia, Autumn, Avestan, Axial precession, Axial tilt, Aztec calendar, Before Present, Big Bang, Boston Latin School, Brunhes–Matuyama reversal, Byr, Cadmium, Calendar, Calendar era, Calendar year, Canada, Celestial mechanics, Common Era, Common year, Correlation and dependence, Cretaceous, Day, Daylight, Dendrochronology, Dinosaur, Dry season, Earth, Earth's orbit, Eastern Orthodox Church, Eclipse, Eclipse season, Ecliptic, Ecliptic coordinate system, Eemian, Egyptian calendar, Ephemeris day, Ephemeris time, ..., Epoch (astronomy), Equinox, Eukaryote, Federal government of the United States, Fiscal year, Friedrich Bessel, Full moon, Full moon cycle, Galactic Center, Galactic year, Gaussian gravitational constant, Gaussian year, Geology, German language, Gothic language, Great Year, Gregorian calendar, Haab', Hebrew calendar, Heliacal rising, Holocene, Homo sapiens, Hour, Ice age, Ice core, India, Integer, Intercalation (timekeeping), International Astronomical Union, International System of Quantities, International Union of Geological Sciences, International Union of Pure and Applied Chemistry, Iran, Iranian calendars, ISO 80000-3, ISO 8601, Jēran, Jesus, Julian calendar, Julian year (astronomy), Kyr, Last Glacial Maximum, Latin, Latin declension, LEAP, Leap second, Leap year, Light-year, List of calendars, List of years, Long and short scales, Lunar calendar, Lunar node, Lunar precession, Man-hour, Mesoamerican calendars, Metric prefix, Millennium, Million, Minute, Monsoon, Month, Muslim, Muslim holidays, Myr, Names of large numbers, Neolithic Revolution, New Scientist, Old Church Slavonic, Old English, Old High German, Old Norse, Orbit, Orbital period, Orders of magnitude (numbers), Oxford English Dictionary, Oxford University Press, Paleontology, Parts-per notation, Pascal (unit), Perihelion and aphelion, Physical cosmology, Physical Review, Planet, Pleistocene, Pliocene, Post-glacial rebound, Precession, Proto-Germanic language, Proto-Indo-European language, Pure and Applied Chemistry, Radiocarbon dating, Ramadan, Recent African origin of modern humans, Red dwarf, Revised Julian calendar, Sanskrit, Sea level rise, Season, Seasonal lag, Seasonal year, Second, Sidereal year, Sirius, Soil fertility, Solar calendar, Solar System, Solstice, Sothic cycle, Spring (season), Subarctic climate, Subtropics, Summer, Sun, Tantalum, Tehran, Temperate climate, Terrestrial Time, Theropoda, Tidal acceleration, Time, Time (Orders of magnitude), Timekeeping on Mars, Tropical year, Tropics, Tungsten, Types of educational institutions, Tyrannosaurus, Unified Code for Units of Measure, Unit of time, United Kingdom, United Kingdom Hydrographic Office, United States, United States Government Publishing Office, Universal Time, University of Massachusetts Press, Uranium-thorium dating, Varve, Vedic Sanskrit, Vegetation, Venus, Weather, Week, West Saxon dialect, Wet season, Winter, Year, Zodiac, 0 (year), 1,000,000,000, 1000 (number), 365-day calendar. Expand index (152 more) »

Academic term

An academic term (or simply "term") is a portion of an academic year, the time during which an educational institution holds classes.

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Academic year

An academic year is a period of time which schools, colleges and universities use to measure a quantity of study.

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Accusative case

The accusative case (abbreviated) of a noun is the grammatical case used to mark the direct object of a transitive verb.

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Afghanistan

Afghanistan (Pashto/Dari:, Afġānistān), officially the Islamic Republic of Afghanistan, is a landlocked country located within South Asia and Central Asia.

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Age of the universe

In physical cosmology, the age of the universe is the time elapsed since the Big Bang.

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Ancient Greek

Ancient Greek includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD.

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Anno Domini

The terms anno Domini (AD or A.D.) and before Christ (BC or B.C.) are used to label or number years in the Julian and Gregorian calendars.

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Apsis

The apsis (Greek ἁψίς), plural apsides (Greek: ἁψίδες) is an extreme point in an object's orbit.

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Archaeology

Archaeology or archeology, is the study of human activity in the past, primarily through the recovery and analysis of the material culture and environmental data that has been left behind by past human populations, which includes artifacts, architecture, biofacts (also known as eco-facts) and cultural landscapes (the archaeological record).

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Armenian calendar

The Armenian calendar uses the calendar era of AD 552, reflecting the separation of the Armenian Apostolic Church from the Roman Church due to the Monophysite schism.

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Astronomical Almanac

The Astronomical AlmanacThe Astronomical Almanac for the Year 2015, (United States Naval Observatory/Nautical Almanac Office, 2014) ISBN 9780707741499.

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Astronomical year numbering

Astronomical year numbering is based on AD/CE year numbering, but follows normal decimal integer numbering more strictly.

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Astronomy

Astronomy is a natural science which is the study of celestial objects (such as stars, galaxies, planets, moons, asteroids, comets and nebulae), the physics, chemistry, and evolution of such objects, and phenomena that originate outside the atmosphere of Earth, including supernovae explosions, gamma ray bursts, and cosmic microwave background radiation.

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Australia

Australia (colloquially), officially the Commonwealth of Australia, is an Oceanian country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands.

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Autumn

Autumn, interchangeably known as fall in North America, is one of the four temperate seasons.

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Avestan

Avestan, formerly also known as "Zend", is an Iranian language of the Eastern Iranian division, known only from its use as the language of Zoroastrian scripture, i.e. the Avesta, from which it derives its name.

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Axial precession

In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis.

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Axial tilt

In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.

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Aztec calendar

The Aztec calendar is the calendar system that was used by the Aztecs as well as other Pre-Columbian peoples of central Mexico.

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Before Present

Before Present (BP) years is a time scale used mainly in geology and other scientific disciplines to specify when events in the past occurred.

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Big Bang

The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution.

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Boston Latin School

The Boston Latin School is a public exam school in Boston, Massachusetts.

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Brunhes–Matuyama reversal

The Brunhes–Matuyama reversal, named after Bernard Brunhes and Motonori Matuyama, was a geologic event, approximately 781,000 years ago, when the Earth's magnetic field last underwent reversal.

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Byr

The abbreviation Byr means "billion years" (109 or 1,000,000,000 years).

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Cadmium

Cadmium is a chemical element with symbol Cd and atomic number 48.

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Calendar

A calendar is a system of organizing days for social, religious, commercial or administrative purposes.

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Calendar era

A calendar era is the year numbering system used by a calendar.

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Calendar year

Generally speaking, a calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day, and thus consists of a whole number of days.

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Canada

Canada is a country, consisting of ten provinces and three territories, in the northern part of the continent of North America.

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Celestial mechanics

Celestial mechanics is the branch of astronomy that deals with the motions of celestial objects.

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Common Era

Common Era (also Current Era or Christian Era), abbreviated as CE, is an alternative naming of the calendar era Anno Domini ("in the year of the/our Lord", abbreviated AD).

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Common year

A Common year is a calendar year with exactly 365 days, in contrast to the longer leap year.

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Correlation and dependence

In statistics, dependence is any statistical relationship between two random variables or two sets of data.

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Cretaceous

The Cretaceous, derived from the Latin "creta" (chalk), usually abbreviated K for its German translation Kreide (chalk), is a geologic period and system from to years (Ma) ago.

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Day

A day is a unit of time.

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Daylight

Daylight or the light of day is the combination of all direct and indirect sunlight during the daytime.

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Dendrochronology

Dendrochronology (from δένδρον, dendron, "tree limb"; χρόνος, khronos, "time"; and -λογία, -logia) or tree-ring dating, is the scientific method of dating based on the analysis of patterns of tree rings, also known as growth rings.

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Dinosaur

Dinosaurs are a diverse group of animals of the clade Dinosauria.

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Dry season

The dry season is a yearly period of low rainfall, especially in the tropics.

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Earth

Earth (also the world, in Greek: Gaia, or in Latin: Terra), is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to accommodate life.

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Earth's orbit

Earth's orbit is the path in which the Earth travels around the Sun.

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Eastern Orthodox Church

The Eastern Orthodox Church, officially the Orthodox Catholic Church, also referred to as the Orthodox Church, Eastern Orthodoxy, and Orthodoxy, is the second largest Christian Church in the world, with an estimated 225–300 million adherents.

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Eclipse

An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer.

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Eclipse season

Eclipse seasons are the only times during a year eclipses can occur, due to the inclination of the Moon's orbit.

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Ecliptic

The ecliptic is the apparent path of the Sun on the celestial sphere, and is the basis for the ecliptic coordinate system.

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Ecliptic coordinate system

The ecliptic coordinate system is a celestial coordinate system commonly used for representing the positions and orbits of Solar System objects.

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Eemian

The Eemian (also Sangamonian, Ipswichian, Mikulin, Kaydaky, Valdivia, Riss-Würm) was the interglacial period which began about 130,000 years ago and ended about 115,000 years ago.

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Egyptian calendar

The ancient civil Egyptian calendar had a year that was 365 days long.

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Ephemeris day

An ephemeris day is a period of 86 400 SI seconds.

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Ephemeris time

The term ephemeris time (often abbreviated ET) can in principle refer to time in connection with any astronomical ephemeris.

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Epoch (astronomy)

In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.

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Equinox

An equinox is an astronomical event in which the plane of Earth's equator passes the center of the Sun.

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Eukaryote

A eukaryote (or or) is any organism whose cells contain a nucleus and other organelles enclosed within membranes.

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Federal government of the United States

The government of the United States of America is the federal government of the republic of fifty states that constitute the United States, as well as one capital district, and several other territories.

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Fiscal year

A fiscal year (or financial year, or sometimes budget year) is a period used for calculating annual ("yearly") financial statements in businesses and other organizations all over the world.

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Friedrich Bessel

Friedrich Wilhelm Bessel (22 July 1784 – 17 March 1846) was a German astronomer, mathematician, physicist and geodesist.

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Full moon

A full moon is the lunar phase that occurs when the Moon is completely illuminated as seen from the Earth.

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Full moon cycle

The full moon cycle is a cycle of about 14 lunations over which full moons vary in apparent size and age (time since new moon).

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Galactic Center

The Galactic Center is the rotational center of the Milky Way.

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Galactic year

The galactic year, also known as a cosmic year, is the duration of time required for the Solar System to orbit once around the center of the Milky Way Galaxy.

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Gaussian gravitational constant

The Gaussian gravitational constant (symbol k) is an astronomical constant first proposed by German polymath Carl Friedrich Gauss in his 1809 work Theoria motus corporum coelestium in sectionibus conicis solem ambientum ("Theory of Motion of the Celestial Bodies Moving in Conic Sections around the Sun"), although he had already used the concept to great success in predicting the orbit of Ceres in 1801.

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Gaussian year

A Gaussian year is defined as 365.2568983 days.

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Geology

Geology (from the Greek γῆ, gē, i.e. "earth" and -λoγία, -logia, i.e. "study of, discourse") is an earth science comprising the study of solid Earth, the rocks of which it is composed, and the processes by which they change.

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German language

German (Deutsch) is a West Germanic language that derives most of its vocabulary from the Germanic branch of the Indo-European language family.

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Gothic language

Gothic is an extinct Germanic language that was spoken by the Goths.

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Great Year

The term Great Year has a variety of related meanings.

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Gregorian calendar

The Gregorian calendar, also called the Western calendar and the Christian calendar, is internationally the most widely used civil calendar.

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Haab'

The Haab' is part of the Maya calendric system.

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Hebrew calendar

The Hebrew or Jewish calendar (ha'luach ha'ivri) is a lunisolar calendar used today predominantly for Jewish religious observances.

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Heliacal rising

The heliacal rising of a star occurs annually when it first becomes visible above the eastern horizon for a brief moment just before sunrise, after a period of time when it had not been visible.

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Holocene

The Holocene is the geological epoch that began after the Pleistocene at approximately 11,700 years BP and continues to the present.

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Homo sapiens

Homo sapiens (Latin: "wise man") is the binomial nomenclature (also known as the scientific name) for the human species.

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Hour

The hour (common symbol: h or hr) is a unit of measurement of time.

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Ice age

An ice age is a period of long-term reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers.

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Ice core

An ice core is a core sample that is typically removed from an ice sheet, most commonly from the polar ice caps of Antarctica, Greenland or from high mountain glaciers elsewhere.

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India

India, officially the Republic of India, is a country in South Asia.

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Integer

An integer (from the Latin ''integer'' meaning "whole")Integer 's first, literal meaning in Latin is "untouched", from in ("not") plus tangere ("to touch").

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Intercalation (timekeeping)

Intercalation is the insertion of a leap day, week or month into some calendar years to make the calendar follow the seasons or moon phases.

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International Astronomical Union

The International Astronomical Union (IAU; Union astronomique internationale, UAI) is a collection of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.

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International System of Quantities

The International System of Quantities (ISQ) is a system based on seven base quantities: length, mass, time, electric current, thermodynamic temperature, amount of substance and luminous intensity.

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International Union of Geological Sciences

The International Union of Geological Sciences (IUGS) is an international non-governmental organization devoted to international cooperation in the field of geology.

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International Union of Pure and Applied Chemistry

The International Union of Pure and Applied Chemistry (IUPAC, or) is an international federation of National Adhering Organizations that represents chemists in individual countries.

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Iran

Iran (or; ایران), historically known as Persia, officially the Islamic Republic of Iran, is a country in Western Asia.

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Iranian calendars

The Iranian calendars (گاه‌شماری ایرانی Gâhshomâriye Irâni) are a succession of calendars invented or used for over two millennia in Iran (Persia).

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ISO 80000-3

ISO 80000-3:2006 is an ISO standard entitled Quantities and units – Part 3: Space and time, superseding ISO 31-1 and ISO 31-2.

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ISO 8601

ISO 8601 Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date and time-related data.

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Jēran

Jera (also Jeran, Jeraz) is the conventional name of the j-rune of the Elder Futhark, from a reconstructed Common Germanic stem *ē2ra-C.f. Page (2005:15).

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Jesus

Jesus (Ἰησοῦς; 7–2 BC to AD 30–33), also referred to as Jesus of Nazareth or Jesus Christ, is the central figure of Christianity, whom the teachings of most Christian denominations hold to be the Son of God.

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Julian calendar

The Julian calendar, introduced by Julius Caesar in 46 BC (708 AUC), was a reform of the Roman calendar.

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Julian year (astronomy)

In astronomy, a Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of SI seconds each.

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Kyr

The abbreviation kyr means "thousand years".

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Last Glacial Maximum

The Last Glacial Maximum (LGM) was the last period in the Earth's climate history during the last glacial period when ice sheets were at their greatest extension.

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Latin

Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.

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Latin declension

Latin is an inflected language, and as such its nouns, pronouns, and adjectives must be declined (i.e. their endings alter to show grammatical case).

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LEAP

Leap may refer to.

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Leap second

A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time, or UT1.

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Leap year

A leap year (also known as an intercalary year or a bissextile year) is a year containing one additional day (or, in the case of lunisolar calendars, a month) in order to keep the calendar year synchronized with the astronomical or seasonal year.

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Light-year

A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.

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List of calendars

This is a list of calendars.

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List of years

This page indexes the individual years pages.

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Long and short scales

The long and short scales are two of several large-number naming systems for integer powers of ten, that use the same words with different meanings:;Long scale: Every new term greater than million is one million times larger than the previous term.

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Lunar calendar

A lunar calendar is a calendar that is based on cycles of the lunar phases.

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Lunar node

The lunar nodes are the orbital nodes of the Moon, that is, the points where the orbit of the Moon crosses the ecliptic.

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Lunar precession

Precession is the rotation of a plane (or its associated perpendicular axis) with respect to a reference plane.

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Man-hour

A man-hour is the amount of work performed by the average worker in one hour.

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Mesoamerican calendars

Mesoamerican calendars are the calendrical systems devised and used by the pre-Columbian cultures of Mesoamerica.

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Metric prefix

A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit.

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Millennium

A millennium (plural millennia) is a period of time equal to 1000 years.

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Million

One million (1,000,000) or one thousand thousand is the natural number following 999,999 and preceding 1,000,001.

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Minute

The minute is a unit of time or of angle.

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Monsoon

Monsoon (UK:; US) is traditionally defined as a seasonal reversing wind accompanied by corresponding changes in precipitation, but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with the asymmetric heating of land and sea.

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Month

A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates.

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Muslim

A Muslim, sometimes spelled Moslem, relates to a person who follows the religion of Islam, a monotheistic and Abrahamic religion based on the Quran.

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Muslim holidays

There are two official holidays in Islam: Eid Al-Fitr and Eid Al-Adha.

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Myr

The abbreviation myr refers to a unit of time equal to one million years.

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Names of large numbers

This article lists and discusses the usage and derivation of names of large numbers, together with their possible extensions.

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Neolithic Revolution

The Neolithic Revolution or Neolithic Demographic Transition, sometimes called the Agricultural Revolution, was the wide-scale transition of many human cultures from a lifestyle of hunting and gathering to one of agriculture and settlement, allowing the ability to support an increasingly large population.

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New Scientist

New Scientist is a UK-based weekly non-peer-reviewed English-language international science magazine, founded in 1956.

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Old Church Slavonic

Old Church Slavonic, also known as Old Church Slavic (often abbreviated to OCS; self-name, slověnĭskŭ językŭ), was the first Slavic literary language.

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Old English

Old English (Ænglisc, Anglisc, Englisc) or Anglo-Saxon is the earliest historical form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages.

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Old High German

Old High German (OHG, German: Althochdeutsch, German abbr. Ahd.) is the earliest stage of the German language, conventionally covering the period from around 700 to 1050 AD.

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Old Norse

Old Norse was a North Germanic language that was spoken by inhabitants of Scandinavia and inhabitants of their overseas settlements during about the 9th to 13th centuries.

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Orbit

In physics, an orbit is the gravitationally curved path of an object around a point in space, for example the orbit of a planet around the center of a star system, such as the Solar System.

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Orbital period

The orbital period is the time taken for a given object to make one complete orbit around another object.

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Orders of magnitude (numbers)

This list contains selected positive numbers in increasing order, including counts of things, dimensionless quantity and probabilities.

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Oxford English Dictionary

The Oxford English Dictionary (OED), published by the Oxford University Press, is a descriptive (as opposed to prescriptive) dictionary of the English language.

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Oxford University Press

Oxford University Press (OUP) is the largest university press in the world, and the second-oldest, after Cambridge University Press.

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Paleontology

Paleontology or palaeontology is the scientific study of life existent prior to, and sometimes including, the start of the Holocene Epoch roughly 11,700 years before present.

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Parts-per notation

In science and engineering, the parts-per notation is a set of pseudo units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction.

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Pascal (unit)

The pascal (symbol: Pa) is the SI derived unit of pressure, internal pressure, stress, Young's modulus and ultimate tensile strength, defined as one newton per square metre.

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Perihelion and aphelion

The perihelion is the point in the orbit of a planet, asteroid, comet or other star-orbiting body where it is nearest to its star.

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Physical cosmology

Physical cosmology is the study of the largest-scale structures and dynamics of the Universe and is concerned with fundamental questions about its origin, structure, evolution, and ultimate fate.

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Physical Review

Physical Review is an American peer-reviewed scientific journal established in 1893 by Edward Nichols.

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Planet

A planet is an astronomical object orbiting a star, brown dwarf, or stellar remnant that.

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Pleistocene

The Pleistocene (symbol PS) is the geological epoch which lasted from about 2,588,000 to 11,700 years ago, spanning the world's recent period of repeated glaciations.

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Pliocene

The Pliocene (also Pleiocene) Epoch (symbol PO) is the period in the geologic timescale that extends from 5.333 million to 2.58 million years BP.

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Post-glacial rebound

Post-glacial rebound (sometimes called continental rebound) is the rise of land masses that were depressed by the huge weight of ice sheets during the last glacial period, through a process known as isostatic depression.

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Precession

Precession is a change in the orientation of the rotational axis of a rotating body.

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Proto-Germanic language

Proto-Germanic (PGmc; German Urgermanisch; also called Common Germanic, German Gemeingermanisch) is the reconstructed proto-language of the Germanic branch of the Indo-European family of languages.

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Proto-Indo-European language

Proto-Indo-European (PIE) is the linguistic reconstruction of the common ancestor of the Indo-European languages.

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Pure and Applied Chemistry

Pure and Applied Chemistry (abbreviated Pure Appl. Chem.) is the official journal for the International Union of Pure and Applied Chemistry.

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Radiocarbon dating

Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

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Ramadan

Ramadan (رمضان,;In Arabic phonology, it can be, depending on the region. also transliterated Ramazan, Ramzan, Ramadhan, or Ramathan) is the ninth month of the Islamic calendar, and is observed by Muslims worldwide as a month of fasting to commemorate the first revelation of the Quran to Muhammad according to Islamic belief.

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Recent African origin of modern humans

In paleoanthropology, the recent African origin of modern humans, or the "out of Africa" theory (OOA), is the most widely accepted model of the geographic origin and early migration of anatomically modern humans.

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Red dwarf

A red dwarf is a small and relatively cool star on the main sequence, either late K or M spectral type.

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Revised Julian calendar

The Revised Julian calendar, also known as the Milanković calendar, or, less formally, New calendar, is a calendar, developed and proposed by the Serbian scientist Milutin Milanković in 1923, which effectively discontinued the 340 years of divergence between the naming of dates sanctioned by those Eastern Orthodox churches adopting it and the Gregorian calendar that has come to predominate worldwide.

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Sanskrit

Sanskrit (Sanskrit: or, originally, "refined speech") is the primary sacred language of Hinduism, a philosophical language in Buddhism, Hinduism and Jainism, and a literary language that was in use as a lingua franca in Greater India.

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Sea level rise

Sea level rise has been estimated to be on average between +2.6 mm and +2.9 mm per year ± 0.4 mm since 1993.

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Season

A season is a division of the year, marked by changes in weather, ecology and hours of daylight.

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Seasonal lag

Seasonal lag is the phenomenon whereby the date of maximum average air temperature at a geographical location on a planet is delayed until some time after the date of maximum insolation.

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Seasonal year

The seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, or the flowering of a species of plant.

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Second

The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units (SI).

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Sidereal year

A sidereal year (from Latin sidus "asterism, star") is the time taken by the Earth to orbit the Sun once with respect to the fixed stars.

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Sirius

Sirius is the brightest star (in fact, a star system) in the Earth's night sky.

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Soil fertility

Soil fertility refers to the ability of a soil related to plants its ease of tillage, fitness of seedbed, and impedance to seedling emergence and root penetration by providing nutrients and suitable soil structure to support the plants/trees growth.

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Solar calendar

A solar calendar is a calendar whose dates indicate the position of Earth on its revolution around the Sun or, equivalently, the apparent position of the sun moving on the celestial sphere.

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Solar System

The Solar SystemCapitalization of the name varies.

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Solstice

A solstice is an astronomical event that occurs twice each year as the Sun reaches its highest or lowest excursion relative to the celestial equator on the celestial sphere.

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Sothic cycle

The Sothic cycle or Canicular period is a period of 1,461 ancient Egyptian years (of 365 days each) or 1,460 Julian years (averaging 365.25 days each).

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Spring (season)

Spring is one of the four conventional temperate seasons, following winter and preceding summer.

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Subarctic climate

The subarctic climate (also called subpolar climate or boreal climate) is a climate characterised by long, usually very cold winters, and short, cool to mild summers.

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Subtropics

The subtropics are geographic and climate zones located roughly between the tropic circle of latitude (the Tropic of Cancer and Tropic of Capricorn) and the 38th parallel in each hemisphere.

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Summer

Summer is the hottest of the four temperate seasons, falling between spring and autumn.

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Sun

The Sun (in Greek: Helios, in Latin: Sol) is the star at the center of the Solar System and is by far the most important source of energy for life on Earth.

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Tantalum

Tantalum is a chemical element with symbol Ta and atomic number 73.

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Tehran

Tehran (also Romanized as Tehrān) is the capital of Iran and Tehran Province.

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Temperate climate

In geography, temperate or tepid latitudes of Earth lie between the tropics and the polar regions.

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Terrestrial Time

Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Earth.

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Theropoda

Theropoda, from Greek meaning "beast feet") are a group of saurischian dinosaurs. Theropods were ancestrally carnivorous, although a number of theropod groups evolved herbivory, omnivory, piscivory, and insectivory. Theropods first appeared during the Carnian age of the late Triassic period 231.4 million years ago (Ma) and included the sole large terrestrial carnivores from the Early Jurassic until at least the close of the Cretaceous, about 66 Ma. In the Jurassic, birds evolved from small specialized coelurosaurian theropods, and are today represented by 10,000 living species. On July 31, 2014, scientists reported details of the evolution of birds from other theropod dinosaurs. Among the features linking theropod dinosaurs to birds are a furcula (wishbone), air-filled bones, brooding of the eggs, and (in coelurosaurs, at least) feathers.

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Tidal acceleration

Tidal acceleration is an effect of the tidal forces between an orbiting natural satellite (e.g. the Moon), and the primary planet that it orbits (e.g. Earth).

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Time

Time is a measure in which events can be ordered from the past through the present into the future, and also the measure of durations of events and the intervals between them.

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Time (Orders of magnitude)

In the context of time, an order of magnitude is a description of the quantity of a time in respect to comparison between differing magnitudes.

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Timekeeping on Mars

Various schemes have been used or proposed for timekeeping on the planet Mars independently of Earth time and calendars.

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Tropical year

A tropical year (also known as a solar year), for general purposes, is the time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice.

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Tropics

The tropics is a region of the Earth surrounding the Equator.

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Tungsten

Tungsten, also known as wolfram, is a chemical element with symbol W and atomic number 74.

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Types of educational institutions

An educational institution is a place where people of different ages gain an education, including preschools, childcare, elementary schools, and universities.

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Tyrannosaurus

Tyrannosaurus (or ("tyrant lizard", from the Ancient Greek tyrannos (τύραννος), "tyrant", and sauros (σαῦρος), "lizard")) is a genus of coelurosaurian theropod dinosaur.

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Unified Code for Units of Measure

The Unified Code for Units of Measure (the UCUM) is a system of codes for unambiguously representing measurement units to both humans and machines.

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Unit of time

The base unit of time in the International System of Units (SI), and by extension most of the Western world, is the second, defined as about 9 thousand million periods of radiation of the caesium atom.

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United Kingdom

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a sovereign state in Europe.

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United Kingdom Hydrographic Office

The United Kingdom Hydrographic Office (or UKHO) is an organisation within the UK government responsible for providing navigational and other hydrographic information for national, civil and defence requirements.

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United States

The United States of America (USA), commonly referred to as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major territories and various possessions.

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United States Government Publishing Office

The United States Government Publishing Office (GPO) is an agency of the legislative branch of the United States federal government.

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Universal Time

Universal Time (UT) is a time standard based on Earth's rotation.

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University of Massachusetts Press

The University of Massachusetts Press is a university press that is part of the University of Massachusetts Amherst.

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Uranium-thorium dating

Uranium-thorium dating, also called thorium-230 dating, uranium-series disequilibrium dating or uranium-series dating, is a radiometric dating technique commonly used to determine the age of calcium carbonate materials such as speleothem or coral.

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Varve

A varve is an annual layer of sediment or sedimentary rock.

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Vedic Sanskrit

Vedic Sanskrit is an Old Indo-Aryan language.

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Vegetation

Vegetation is assemblages of plant species and the ground cover they provide.

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Venus

Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.

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Weather

Weather is the state of the atmosphere, to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudy.

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Week

A week is a time unit equal to seven days.

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West Saxon dialect

West Saxon was one of four distinct dialects of Old English.

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Wet season

The rainy season, or monsoon season, is the time of year when most of a region's average annual rainfall occurs.

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Winter

Winter is the coldest season of the year in polar and temperate climates, between autumn and spring.

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Year

A year is the orbital period of the Earth moving in its orbit around the Sun.

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Zodiac

In both astrology and historical astronomy, the zodiac (Greek: ζῳδιακός, zōidiakos) is a circle of twelve 30° divisions of celestial longitude that are centered upon the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year.

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0 (year)

Year zero does not exist in the Anno Domini (or Common Era) system usually used to number years in the Gregorian calendar and in its predecessor, the Julian calendar.

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1,000,000,000

1,000,000,000 (one billion, short scale; one thousand million or milliard, yard, long scale) is the natural number following 999,999,999 and preceding 1,000,000,001.

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1000 (number)

1000 or one thousand is the natural number following 999 and preceding 1001 in most English-speaking countries.

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365-day calendar

A 365-day calendar consists of exactly 365 days per year (no leap days), and is primarily used in computer models and as an assumption in every-day calculations.

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Redirects here:

525600, A (year), Annum, Annum (unit), Annus, Anomalistic year, Astronomical year, Draconitic year, Dracontic year, Earth year, Earth years, Eclipse year, Ecliptic year, Exa-annum, Exaannum, Exayear, Ga (unit), Giga-annum, Gigaanna, Gigaannum, Gigaannus, Gigayear, Gregorian Year, Gregorian year, Heliacal year, Kiloannum, Kiloannus, Ma (unit), Mega Year, Mega-annum, Megaannum, Megaannus, Megayear, Mya (unit), Petaanna, Petayear, SI annus, SI year, Terayear, The Year, The year, Twelvemonth, Tya (unit), Y and yr, Yaer, Year duration, Yearly, Years, Yottayear, Zettayear.

References

[1] https://en.wikipedia.org/wiki/Year

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