99 relations: Agnes of Rome, American English, Ancient Egypt, Ancient Rome, Atmosphere of Earth, Atom, Atomic electron transition, British English, Caesium, Calendar date, Calendar day, Celestial equator, Christmas Eve, Circadian rhythm, Coordinated Universal Time, Culmination, Damascus Document, Dawn, Daylight, Daylight saving time, Daytime, Dead Sea Scrolls, Decimal time, Determination of the day of the week, Diurnality, Dutch language, Earth's rotation, Energy level, Evening, Florentine calendar, French Republican Calendar, Halloween, History of China, Holiday, Horizon, Hour, Hyperfine structure, International Bureau of Weights and Measures, International Earth Rotation and Reference Systems Service, International System of Units, ISO 8601, Judaism, Leap second, Longitude, Magnitude (astronomy), Meridian (geography), Middle Ages, Midnight, Midnight sun, Millisecond, ..., Minute and second of arc, Moon, Morning, Nederlandse Spoorwegen, Night, Noon, Nychthemeron, Old English, Orders of magnitude (time), Origin of the Moon, Oxford University Press, Proto-Indo-European language, Public transport, Radioactive decay, Rail transport, Refraction, Rhythmite, Rotation, Rotation period, Sandstone, Season, Second, Shabbat, SI base unit, Sidereal time, Solar time, Stationary state, Sundial, Sunlight, Sunrise, Sunset, Synodic day, Ticket (admission), Tidal acceleration, Tide, Time, Time zone, Traditional Chinese timekeeping, Transport for London, Tropical year, Turkey, Twilight, Unit of measurement, UTC±00:00, Videocassette recorder, Week, World Meteorological day, Year, 12-hour clock. Expand index (49 more) » « Shrink index
Agnes of Rome is a virgin–martyr, venerated as a saint in the Roman Catholic Church, Eastern Orthodox Church, the Anglican Communion, and Lutheranism.
American English (AmE, AE, AmEng, USEng, en-US), 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 was a civilization of ancient Northeastern Africa, concentrated along the lower reaches of the Nile River - geographically Lower Egypt and Upper Egypt, in the place that is now occupied by the countries of Egypt and Sudan.
In historiography, ancient Rome is Roman civilization from the founding of the city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD, encompassing the Roman Kingdom, Roman Republic and Roman Empire until the fall of the western empire.
The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.
An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
Atomic electron transition is a change of an electron from one energy level to another within an atom or artificial atom.
British English is the standard dialect of English language as spoken and written in the United Kingdom.
Caesium (British spelling and IUPAC spelling) or cesium (American spelling) is a chemical element with symbol Cs and atomic number 55.
A calendar date is a reference to a particular day represented within a calendar system.
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.
Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.
A circadian rhythm is any biological process that displays an endogenous, entrainable oscillation of about 24 hours.
In astronomy, the culmination of a planet, star, or constellation is its transit over an observer's meridian.
The Damascus Document (the Cairo Damascus document, CD) or Damascus Rule is one of the most interesting texts of the Dead Sea Scrolls because it is the only Qumran work discovered in the first cave's scrolls that was known before the discovery of the Dead Sea Scrolls.
Dawn, from an Old English verb dagian: "to become day", is the time that marks the beginning of twilight before sunrise.
Daylight, or the light of day, is the combination of all direct and indirect sunlight during the daytime.
Daylight saving time (abbreviated DST), sometimes referred to as daylight savings time in U.S., Canadian, and Australian speech, and known as summer time in some countries, is the practice of advancing clocks during summer months so that evening daylight lasts longer, while sacrificing normal sunrise times.
On Earth, daytime is roughly the period of the day during which any given point in the world experiences natural illumination from especially direct sunlight.
Dead Sea Scrolls (also Qumran Caves Scrolls) are ancient Jewish religious, mostly Hebrew, manuscripts found in the Qumran Caves near the Dead Sea.
Decimal time is the representation of the time of day using units which are decimally related.
The determination of the day of the week for any date may be performed with a variety of algorithms.
Diurnality is a form of plant or animal behavior characterized by activity during the day, with a period of sleeping, or other inactivity, at night.
The Dutch language is a West Germanic language, spoken by around 23 million people as a first language (including the population of the Netherlands where it is the official language, and about sixty percent of Belgium where it is one of the three official languages) and by another 5 million as a second language.
Earth's rotation is the rotation of Planet Earth around its own axis.
A quantum mechanical system or particle that is bound—that is, confined spatially—can only take on certain discrete values of energy.
Evening is a daily astronomic event of variable time period between daytime and night.
The Florentine calendar was used in the Republic of Florence, in Italy during the Middle Ages.
The French Republican Calendar (calendrier républicain français), also commonly called the French Revolutionary Calendar (calendrier révolutionnaire français), was a calendar created and implemented during the French Revolution, and used by the French government for about 12 years from late 1793 to 1805, and for 18 days by the Paris Commune in 1871.
Halloween or Hallowe'en (a contraction of All Hallows' Evening), also known as Allhalloween, All Hallows' Eve, or All Saints' Eve, is a celebration observed in a number of countries on 31 October, the eve of the Western Christian feast of All Hallows' Day.
The earliest known written records of the history of China date from as early as 1250 BC,William G. Boltz, Early Chinese Writing, World Archaeology, Vol.
A holiday is a day set aside by custom or by law on which normal activities, especially business or work including school, are suspended or reduced.
The horizon or skyline is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those that do not.
An hour (symbol: h; also abbreviated hr.) is a unit of time conventionally reckoned as of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions.
In atomic physics, hyperfine structure refers to small shifts and splittings in the energy levels of atoms, molecules and ions, due to interaction between the state of the nucleus and the state of the electron clouds.
The International Bureau of Weights and Measures (Bureau international des poids et mesures) is an intergovernmental organization established by the Metre Convention, through which Member States act together on matters related to measurement science and measurement standards.
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.
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
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.
Judaism (originally from Hebrew, Yehudah, "Judah"; via Latin and Greek) is the religion of the Jewish people.
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 as realized by UT1.
Longitude, is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.
In astronomy, magnitude is a logarithmic measure of the brightness of an object in a defined passband, often in the visible or infrared spectrum, but sometimes across all wavelengths.
A (geographical) meridian (or line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the North Pole and the South Pole, connecting points of equal longitude.
In the history of Europe, the Middle Ages (or Medieval Period) lasted from the 5th to the 15th century.
Midnight is the transition time from one day to the next – the moment when the date changes.
The midnight sun is a natural phenomenon that occurs in the summer months in places north of the Arctic Circle or south of the Antarctic Circle, when the sun remains visible at the local midnight.
A millisecond (from milli- and second; symbol: ms) is a thousandth (0.001 or 10−3 or 1/1000) of a second.
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.
Morning is the interval between sunrise and noon.
Nederlandse Spoorwegen (NS;; "Dutch Railways") a Dutch state-owned company, the principal passenger railway operator in the Netherlands.
Night or nighttime (sp. night-time or night time) is the period of time between sunset and sunrise, when the Sun is below the horizon.
Noon (also midday or noon time) is 12 o'clock in the daytime, as opposed to midnight.
Nychthemeron, occasionally nycthemeron or nuchthemeron (Greek νυχθήμερον from the words nykt- "night", and hemera "day, daytime"), is a period of 24 consecutive hours.
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.
An order of magnitude of time is (usually) a decimal prefix or decimal order-of-magnitude quantity together with a base unit of time, like a microsecond or a million years.
The origin of the Moon is usually thought to be that a Mars-sized body struck the Earth, making a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternate explanations, and research into how the Moon came to be continues.
Oxford University Press (OUP) is the largest university press in the world, and the second oldest after Cambridge University Press.
Proto-Indo-European (PIE) is the linguistic reconstruction of the hypothetical common ancestor of the Indo-European languages, the most widely spoken language family in the world.
Public transport (also known as public transportation, public transit, or mass transit) is transport of passengers by group travel systems available for use by the general public, typically managed on a schedule, operated on established routes, and that charge a posted fee for each trip.
Radioactive decay (also known as nuclear decay or radioactivity) is the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron in the case of internal conversion.
Rail transport is a means of transferring of passengers and goods on wheeled vehicles running on rails, also known as tracks.
Refraction is the change in direction of wave propagation due to a change in its transmission medium.
A rhythmite consists of layers of sediment or sedimentary rock which are laid down with an obvious periodicity and regularity.
A rotation is a circular movement of an object around a center (or point) of rotation.
In astronomy, the rotation period of a celestial object is the time that it takes to complete one revolution around its axis of rotation relative to the background stars.
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) mineral particles or rock fragments.
A season is a division of the year marked by changes in weather, ecology, and amount of daylight.
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 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.
Shabbat (שַׁבָּת, "rest" or "cessation") or Shabbos (Ashkenazi Hebrew and שבת), or the Sabbath is Judaism's day of rest and seventh day of the week, on which religious Jews, Samaritans and certain Christians (such as Seventh-day Adventists, the 7th Day movement and Seventh Day Baptists) remember the Biblical creation of the heavens and the earth in six days and the Exodus of the Hebrews, and look forward to a future Messianic Age.
The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units can be derived.
Sidereal time is a timekeeping system that astronomers use to locate celestial objects.
Solar time is a calculation of the passage of time based on the position of the Sun in the sky.
A stationary state is a quantum state with all observables independent of time.
A sundial is a device that tells the time of day when there is sunlight by the apparent position of the Sun in the sky.
Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.
Sunrise or sun up is the instant at which the upper edge of the Sun appears over the horizon in the morning.
Sunset or sundown is the daily disappearance of the Sun below the horizon as a result of Earth's rotation.
A synodic day is the period it takes for a planet to rotate once in relation to the body it is orbiting.
A ticket is a voucher that indicates that an individual is entitled to admission to an event or establishment such as a theatre, amusement park or tourist attraction, or has a right to travel on a vehicle, such as with an airline ticket, bus ticket or train ticket.
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).
Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of Earth.
Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes.
The traditional Chinese time systems refers to the time standards for divisions of the day used in China until the introduction of the Shixian calendar at the beginning of the Qing dynasty.
Transport for London (TfL) is a local government body responsible for the transport system in Greater London, England.
A tropical year (also known as a solar year) 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.
Turkey (Türkiye), officially the Republic of Turkey (Türkiye Cumhuriyeti), is a transcontinental country in Eurasia, mainly in Anatolia in Western Asia, with a smaller portion on the Balkan peninsula in Southeast Europe.
Twilight on Earth is the illumination of the lower atmosphere when the Sun itself is not directly visible because it is below the horizon.
A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.
UTC±00:00 is the following time.
A videocassette recorder, VCR, or video recorder is an electromechanical device that records analog audio and analog video from broadcast television or other source on a removable, magnetic tape videocassette, and can play back the recording.
A week is a time unit equal to seven days.
The date of the establishment of the World Meteorological Organization in 23 March 1950 has been named World Meteorological Day. This organization announces a slogan for World Meteorology Day every year, and this day is celebrated in all member countries.
A year is the orbital period of the Earth moving in its orbit around the Sun.
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: "The use of AM or PM to designate either noon or midnight can cause ambiguity.