Table of Contents
143 relations: Afternoon, Agnes of Rome, American English, Ancient Egypt, Ancient Rome, Astronomical object, Astronomy, Atmosphere of Earth, Atom, Book of Genesis, Caesium, Calendar, Calendar date, Cambrian, Cambridge Advanced Learner's Dictionary, Carboniferous, Celestial equator, Celestial sphere, Ceres (dwarf planet), Christmas Eve, Chronometry, Circadian rhythm, Collins English Dictionary, Computer, Coordinated Universal Time, Cretaceous, Culmination, Danish language, Darkness, Dawn, Day length fluctuations, Daylight saving time, Daytime, Decimal time, Determination of the day of the week, Devonian, Diurnality, Dusk, Dutch language, Earth, Earth's rotation, Encyclopædia Britannica, Energy level, English language in England, Evening, Florentine calendar, Fossil, Friday, German language, Gravity, ... Expand index (93 more) »
- Orders of magnitude (time)
Afternoon
Afternoon is the time between noon and sunset or evening.
Agnes of Rome
Agnes of Rome is a virgin martyr, venerated as a saint in the Catholic Church, Oriental Orthodox Church and the Eastern Orthodox Church, as well as the Anglican Communion and Lutheran Churches.
American English
American English (AmE), sometimes called United States English or U.S. English, is the set of varieties of the English language native to the United States.
Ancient Egypt
Ancient Egypt was a civilization of ancient Northeast Africa.
Ancient Rome
In modern historiography, ancient Rome is the Roman civilisation from the founding of the Italian city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD.
Astronomical object
An astronomical object, celestial object, stellar object or heavenly body is a naturally occurring physical entity, association, or structure that exists within the observable universe.
See Day and Astronomical object
Astronomy
Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos.
Atmosphere of Earth
The atmosphere of Earth is composed of a layer of gas mixture that surrounds the Earth's planetary surface (both lands and oceans), known collectively as air, with variable quantities of suspended aerosols and particulates (which create weather features such as clouds and hazes), all retained by Earth's gravity.
See Day and Atmosphere of Earth
Atom
Atoms are the basic particles of the chemical elements.
See Day and Atom
Book of Genesis
The Book of Genesis (from Greek; בְּרֵאשִׁית|Bərēʾšīṯ|In beginning; Liber Genesis) is the first book of the Hebrew Bible and the Christian Old Testament.
Caesium
Caesium (IUPAC spelling; cesium in American English) is a chemical element; it has symbol Cs and atomic number 55.
See Day and Caesium
Calendar
A calendar is a system of organizing days. Day and calendar are units of time.
See Day and Calendar
Calendar date
A calendar date is a reference to a particular day represented within a calendar system.
Cambrian
The Cambrian is the first geological period of the Paleozoic Era, and the Phanerozoic Eon.
See Day and Cambrian
Cambridge Advanced Learner's Dictionary
The Cambridge Advanced Learner's Dictionary (abbreviated CALD) is a British dictionary of the English language.
See Day and Cambridge Advanced Learner's Dictionary
Carboniferous
The Carboniferous is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period Ma (million years ago) to the beginning of the Permian Period, Ma.
Celestial equator
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.
Celestial sphere
In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth.
Ceres (dwarf planet)
Ceres (minor-planet designation: 1 Ceres) is a dwarf planet in the middle main asteroid belt between the orbits of Mars and Jupiter.
See Day and Ceres (dwarf planet)
Christmas Eve
Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.
Chronometry
Chronometry or horology is the science studying the measurement of time and timekeeping. Chronometry enables the establishment of standard measurements of time, which have applications in a broad range of social and scientific areas. Horology usually refers specifically to the study of mechanical timekeeping devices, while chronometry is broader in scope, also including biological behaviours with respect to time (biochronometry), as well as the dating of geological material (geochronometry).
Circadian rhythm
A circadian rhythm, or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.
Collins English Dictionary
The Collins English Dictionary is a printed and online dictionary of English.
See Day and Collins English Dictionary
Computer
A computer is a machine that can be programmed to automatically carry out sequences of arithmetic or logical operations (computation).
See Day and Computer
Coordinated Universal Time
Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time.
See Day and Coordinated Universal Time
Cretaceous
The Cretaceous is a geological period that lasted from about 145 to 66 million years ago (Mya).
Culmination
In observational astronomy, culmination is the passage of a celestial object (such as the Sun, the Moon, a planet, a star, constellation or a deep-sky object) across the observer's local meridian.
Danish language
Danish (dansk, dansk sprog) is a North Germanic language from the Indo-European language family spoken by about six million people, principally in and around Denmark.
Darkness
Darkness is defined as a lack of illumination, an absence of visible light, or a surface that absorbs light.
See Day and Darkness
Dawn
Dawn is the time that marks the beginning of twilight before sunrise.
See Day and Dawn
Day length fluctuations
The length of the day (LOD), which has increased over the long term of Earth's history due to tidal effects, is also subject to fluctuations on a shorter scale of time.
See Day and Day length fluctuations
Daylight saving time
Daylight saving time (DST), also referred to as daylight saving(s), daylight savings time, daylight time (United States and Canada), or summer time (United Kingdom, European Union, and others), is the practice of advancing clocks to make better use of the longer daylight available during summer so that darkness falls at a later clock time.
See Day and Daylight saving time
Daytime
Daytime as observed on Earth is the period of the day during which a given location experiences natural illumination from direct sunlight.
See Day and Daytime
Decimal time
Decimal time is the representation of the time of day using units which are decimally related. Day and decimal time are units of time.
Determination of the day of the week
The determination of the day of the week for any date may be performed with a variety of algorithms.
See Day and Determination of the day of the week
Devonian
The Devonian is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.3 million years from the end of the preceding Silurian period at million years ago (Ma), to the beginning of the succeeding Carboniferous period at Ma.
See Day and Devonian
Diurnality
Diurnality is a form of plant and animal behavior characterized by activity during daytime, with a period of sleeping or other inactivity at night.
Dusk
Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight after sunset and just before nightfall.
See Day and Dusk
Dutch language
Dutch (Nederlands.) is a West Germanic language, spoken by about 25 million people as a first language and 5 million as a second language and is the third most spoken Germanic language.
Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
See Day and Earth
Earth's rotation
Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space.
Encyclopædia Britannica
The British Encyclopaedia is a general knowledge English-language encyclopaedia.
See Day and Encyclopædia Britannica
Energy level
A quantum mechanical system or particle that is bound—that is, confined spatially—can only take on certain discrete values of energy, called energy levels.
English language in England
The English language spoken and written in England encompasses a diverse range of accents and dialects.
See Day and English language in England
Evening
Evening is the period of a day that begins at the end of daylight and overlaps with the beginning of night.
See Day and Evening
Florentine calendar
The Florentine calendar, also referred to as the stylus Florentinus ("Florentine style"), was the calendar used in the Republic of Florence in Italy during the Middle Ages.
See Day and Florentine calendar
Fossil
A fossil (from Classical Latin) is any preserved remains, impression, or trace of any once-living thing from a past geological age.
See Day and Fossil
Friday
Friday is the day of the week between Thursday and Saturday.
See Day and Friday
German language
German (Standard High German: Deutsch) is a West Germanic language in the Indo-European language family, mainly spoken in Western and Central Europe. It is the most widely spoken and official or co-official language in Germany, Austria, Switzerland, Liechtenstein, and the Italian province of South Tyrol.
Gravity
In physics, gravity is a fundamental interaction which causes mutual attraction between all things that have mass.
See Day and Gravity
Halloween
Halloween or Hallowe'en (less commonly known as Allhalloween, All Hallows' Eve, or All Saints' Eve) is a celebration observed in many countries on 31 October, the eve of the Western Christian feast of All Hallows' Day.
Hebrew Bible
The Hebrew Bible or Tanakh (. Random House Webster's Unabridged Dictionary. Hebrew), also known in Hebrew as Miqra (Hebrew), is the canonical collection of Hebrew scriptures, comprising the Torah, the Nevi'im, and the Ketuvim.
Hebrew calendar
The Hebrew calendar (translit), also called the Jewish calendar, is a lunisolar calendar used today for Jewish religious observance and as an official calendar of Israel.
History of China
The history of China spans several millennia across a wide geographical area.
Holiday
A holiday is a day or other period of time set aside for festivals or recreation.
See Day and Holiday
Horizon
The horizon is the apparent curve that separates the surface of a celestial body from its sky when viewed from the perspective of an observer on or near the surface of the relevant body.
See Day and Horizon
Hour
An hour (symbol: h; also abbreviated hr) is a unit of time historically reckoned as of a day and defined contemporarily as exactly 3,600 seconds (SI). Day and hour are Orders of magnitude (time) and units of time.
See Day and Hour
Hyperfine structure
In atomic physics, hyperfine structure is defined by small shifts in otherwise degenerate electronic energy levels and the resulting splittings in those electronic energy levels of atoms, molecules, and ions, due to electromagnetic multipole interaction between the nucleus and electron clouds.
See Day and Hyperfine structure
Icelandic language
Icelandic (íslenska) is a North Germanic language from the Indo-European language family spoken by about 314,000 people, the vast majority of whom live in Iceland, where it is the national language.
See Day and Icelandic language
International Bureau of Weights and Measures
The International Bureau of Weights and Measures (Bureau international des poids et mesures, BIPM) is an intergovernmental organisation, through which its 59 member-states act on measurement standards in areas including chemistry, ionising radiation, physical metrology, as well as the International System of Units (SI) and Coordinated Universal Time (UTC).
See Day and International Bureau of Weights and Measures
International Earth Rotation and Reference Systems Service
The International Earth Rotation and Reference Systems Service (IERS), formerly the International Earth Rotation Service, is the body responsible for maintaining global time and reference frame standards, notably through its Earth Orientation Parameter (EOP) and International Celestial Reference System (ICRS) groups.
See Day and International Earth Rotation and Reference Systems Service
International System of Units
The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement.
See Day and International System of Units
ISO 8601
ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.
See Day and ISO 8601
ISO week date
The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO) since 1988 (last revised in 2019) and, before that, it was defined in ISO (R) 2015 since 1971.
John W. Wells
John West Wells (July 15, 1907 – January 12, 1994) was an American paleontologist, biologist and geologist who focused his research on corals.
Judaism
Judaism (יַהֲדוּת|translit.
See Day and Judaism
Jupiter
Jupiter is the fifth planet from the Sun and the largest in the Solar System.
See Day and Jupiter
Leap second
A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC), to accommodate the difference between precise time (International Atomic Time (TAI), as measured by atomic clocks) and imprecise observed solar time (UT1), which varies due to irregularities and long-term slowdown in the Earth's rotation.
Life
Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not.
See Day and Life
Light pollution
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting.
Local mean time
Local mean time (LMT) is a form of solar time that corrects the variations of local apparent time, forming a uniform time scale at a specific longitude.
Longitude
Longitude is a geographic coordinate that specifies the east–west position of a point on the surface of the Earth, or another celestial body.
Lunar calendar
A lunar calendar is a calendar based on the monthly cycles of the Moon's phases (synodic months, lunations), in contrast to solar calendars, whose annual cycles are based on the solar year.
Lunar phase
A lunar phase or Moon phase is the apparent shape of the Moon's directly sunlit portion as viewed from the Earth (because the Moon is tidally locked with the Earth, the same hemisphere is always facing the Earth).
Magnitude (astronomy)
In astronomy, magnitude is measure of the brightness of an object, usually in a defined passband.
See Day and Magnitude (astronomy)
Man-hour
A man-hour or human-hour is the amount of work performed by the average worker in one hour.
See Day and Man-hour
Mars
Mars is the fourth planet from the Sun.
See Day and Mars
Mercury (planet)
Mercury is the first planet from the Sun and the smallest in the Solar System.
Meridian (geography)
In geography and geodesy, a meridian is the locus connecting points of equal longitude, which is the angle (in degrees or other units) east or west of a given prime meridian (currently, the IERS Reference Meridian).
See Day and Meridian (geography)
Metric time
Metric time is the measure of time intervals using the metric system.
Middle Ages
In the history of Europe, the Middle Ages or medieval period (also spelt mediaeval or mediæval) lasted from approximately 500 to 1500 AD.
Midnight
Midnight is the transition time from one day to the next – the moment when the date changes, on the local official clock time for any particular jurisdiction.
See Day and Midnight
Midtown Manhattan
Midtown Manhattan is the central portion of the New York City borough of Manhattan and serves as the city's primary central business district.
Millisecond
A millisecond (from milli- and second; symbol: ms) is a unit of time in the International System of Units equal to one thousandth (0.001 or 10−3 or 1/1000) of a second or 1000 microseconds. Day and millisecond are Orders of magnitude (time).
Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol, is a unit of angular measurement equal to of one degree.
See Day and Minute and second of arc
Month
A month is a unit of time, used with calendars, that is approximately as long as a natural orbital period of the Moon; the words month and Moon are cognates. Day and month are Orders of magnitude (time) and units of time.
See Day and Month
Moon
The Moon is Earth's only natural satellite.
See Day and Moon
Morning
Morning is the period from sunrise to noon.
See Day and Morning
NASA
The National Aeronautics and Space Administration (NASA) is an independent agency of the U.S. federal government responsible for the civil space program, aeronautics research, and space research.
See Day and NASA
National Academy of Sciences
The National Academy of Sciences (NAS) is a United States nonprofit, non-governmental organization.
See Day and National Academy of Sciences
Neptune
Neptune is the eighth and farthest known planet from the Sun.
See Day and Neptune
Night
Night or nighttime is the period of darkness when the Sun is below the horizon.
See Day and Night
Non-SI units mentioned in the SI
While the International System of Units (SI) is used throughout the world in all fields, many non-SI units continue to be used in the scientific, technical, and commercial literature.
See Day and Non-SI units mentioned in the SI
Noon
Noon (or midday) is 12 o'clock in the daytime.
See Day and Noon
Nychthemeron
Nychthemeron, occasionally nycthemeron or nuchthemeron, is a period of 24 consecutive hours. Day and Nychthemeron are units of time.
Old English
Old English (Englisċ or Ænglisc), or Anglo-Saxon, was the earliest recorded form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages.
Ordinal date
An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also known as ordinal day or day number).
Pluto
Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune.
See Day and Pluto
Productivity
Productivity is the efficiency of production of goods or services expressed by some measure.
Proto-Germanic language
Proto-Germanic (abbreviated PGmc; also called Common Germanic) is the reconstructed proto-language of the Germanic branch of the Indo-European languages.
See Day and Proto-Germanic language
Radioactive decay
Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation.
Rail transport
Rail transport (also known as train transport) is a means of transport using wheeled vehicles running in tracks, which usually consist of two parallel steel rails.
Refraction
In physics, refraction is the redirection of a wave as it passes from one medium to another.
Rotation
Rotation or rotational motion is the circular movement of an object around a central line, known as axis of rotation.
See Day and Rotation
Rotation period (astronomy)
In astronomy, the rotation period or spin period of a celestial object (e.g., star, planet, moon, asteroid) has two definitions.
See Day and Rotation period (astronomy)
Saturn
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.
See Day and Saturn
Season
A season is a division of the year based on changes in weather, ecology, and the number of daylight hours in a given region. Day and season are units of time.
See Day and Season
Second
The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60. Day and second are Orders of magnitude (time) and units of time.
See Day and Second
Sidereal time
Sidereal time ("sidereal" pronounced) is a system of timekeeping used especially by astronomers. Day and Sidereal time are units of time.
Solar calendar
A solar calendar is a calendar whose dates indicate the season or almost equivalently the apparent position of the Sun relative to the stars.
Solar System
The Solar SystemCapitalization of the name varies.
Space.com
Space.com is an online publication focused on space exploration, astronomy, skywatching and entertainment, with editorial teams based in the United States and United Kingdom.
Springer Science+Business Media
Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing.
See Day and Springer Science+Business Media
Standard time
Standard time is the synchronization of clocks within a geographical region to a single time standard, rather than a local mean time standard.
Stationary state
A stationary state is a quantum state with all observables independent of time.
Sun
The Sun is the star at the center of the Solar System.
See Day and Sun
Sundial
A sundial is a horological device that tells the time of day (referred to as civil time in modern usage) when direct sunlight shines by the apparent position of the Sun in the sky.
See Day and Sundial
Sunlight
Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.
See Day and Sunlight
Sunrise
Sunrise (or sunup) is the moment when the upper rim of the Sun appears on the horizon in the morning.
See Day and Sunrise
Sunset
Sunset (or sundown) is the disappearance of the Sun below the horizon of the Earth (or any other astronomical object in the Solar System) due to its rotation.
See Day and Sunset
Swedish language
Swedish (svenska) is a North Germanic language from the Indo-European language family, spoken predominantly in Sweden and in parts of Finland.
Synodic day
A synodic day (or synodic rotation period or solar day) is the period for a celestial object to rotate once in relation to the star it is orbiting, and is the basis of solar time. Day and synodic day are units of time.
The Verge
The Verge is an American technology news website headquartered in Lower Manhattan, New York City and operated by Vox Media.
Thermoregulation
Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even when the surrounding temperature is very different.
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).
See Day and Tidal acceleration
Time
Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, and into the future.
See Day and Time
Time zone
A time zone is an area which observes a uniform standard time for legal, commercial and social purposes.
Traffic collision
A traffic collision, also known as a motor vehicle collision, or car crash, occurs when a vehicle collides with another vehicle, pedestrian, animal, road debris, or other moving or stationary obstruction, such as a tree, pole or building.
Triassic
The Triassic (sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago (Mya), to the beginning of the Jurassic Period 201.4 Mya.
See Day and Triassic
Tropical year
A tropical year or solar year (or tropical period) is the time that the Sun takes to return to the same position in the sky – as viewed from the Earth or another celestial body of the Solar System – thus completing a full cycle of astronomical seasons. Day and tropical year are units of time.
Tropics
The tropics are the regions of Earth surrounding the Equator.
See Day and Tropics
Twilight
Twilight is light produced by sunlight scattering in the upper atmosphere, when the Sun is below the horizon, which illuminates the lower atmosphere and the Earth's surface.
See Day and Twilight
United States Naval Observatory
The United States Naval Observatory (USNO) is a scientific and military facility that produces geopositioning, navigation and timekeeping data for the United States Navy and the United States Department of Defense.
See Day and United States Naval Observatory
Universe
The universe is all of space and time and their contents.
See Day and Universe
Uranus
Uranus is the seventh planet from the Sun.
See Day and Uranus
UTC+00:00
UTC+00:00 is an identifier for a time offset from UTC of +00:00.
Venus
Venus is the second planet from the Sun.
See Day and Venus
Week
A week is a unit of time equal to seven days. Day and week are units of time.
See Day and Week
Workweek and weekend
The weekdays and weekend are the complementary parts of the week devoted to labour and rest, respectively.
See Day and Workweek and weekend
World Meteorological Day
World Meteorological Day was established in 1951 to commemorate the establishment of the World Meteorological Organization on 23 March 1950.
See Day and World Meteorological Day
Year
A year is the time taken for astronomical objects to complete one orbit.
See Day and Year
12-hour clock
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin, translating to "before midday") and p.m. (from Latin, translating to "after midday").
24-hour clock
The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours.
See also
Orders of magnitude (time)
- Attosecond
- Day
- Detailed logarithmic timeline
- Femtosecond
- Hour
- Logarithmic timeline
- Microsecond
- Millisecond
- Minute
- Month
- Nanosecond
- Orders of magnitude (time)
- Picosecond
- Second
References
Also known as Civil day, Day duration, Day unit, Parts of a day, Parts of the day, SI day, SI days, Seconds in a day, .