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55 relations: Accuracy and precision, Astronomical day, Barycentric Dynamical Time, Chatham Islands, Chatham Standard Time Zone, Civil time, Clock, Coordinated Universal Time, DUT1, Ephemeris time, Eucla, Western Australia, General relativity, Global Positioning System, Greenwich Mean Time, International Astronomical Union, International Atomic Time, International Celestial Reference Frame, International Earth Rotation and Reference Systems Service, International Meridian Conference, International System of Units, International Telecommunication Union, International Terrestrial Reference System, Jet Propulsion Laboratory, Julian day, Leap second, List of international common standards, Map, Marine chronometer, Moon, Nautical chart, Nepal Standard Time, Newton's laws of motion, Planet, Polar motion, Prime meridian (Greenwich), Quasar, Radar, Rail transport, Royal Observatory, Greenwich, Sandford Fleming, Sidereal time, Solar time, Standard time, Standard Time Act, Star, Sun, Telegraphy, Terrestrial Time, Tidal acceleration, Time standard, ..., Time zone, Train, United States Naval Observatory, Unix time, Very-long-baseline interferometry. Expand index (5 more) »
Accuracy and precision
Precision is a description of random errors, a measure of statistical variability.
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Astronomical day
An astronomical day refers to a length of day of exactly or nearly 24 hours beginning at noon instead of at midnight.
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Barycentric Dynamical Time
Barycentric Dynamical Time (TDB, from the French Temps Dynamique Barycentrique) is a relativistic coordinate time scale, intended for astronomical use as a time standard to take account of time dilation when calculating orbits and astronomical ephemerides of planets, asteroids, comets and interplanetary spacecraft in the Solar System.
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Chatham Islands
The Chatham Islands form an archipelago in the Pacific Ocean about east of the South Island of New Zealand.
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Chatham Standard Time Zone
The Chatham Standard Time Zone is a geographic region that keeps time by adding twelve hours and forty-five minutes to Coordinated Universal Time (UTC) resulting in UTC+12:45.
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Civil time
In modern usage, civil time refers to statutory time scales designated by civilian authorities, or to local time indicated by clocks.
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Clock
A clock is an instrument to measure, keep, and indicate time.
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Coordinated Universal Time
No description.
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DUT1
The time correction DUT1 (sometimes also written DUT) is the difference between Universal Time (UT1), which is defined by Earth's rotation, and Coordinated Universal Time (UTC), which is defined by a network of precision atomic clocks.
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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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Eucla, Western Australia
Eucla is the easternmost locality in Western Australia, located in the Goldfields-Esperance region of Western Australia along the Eyre Highway, approximately west of the South Australian border.
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General relativity
General relativity (GR, also known as the general theory of relativity or GTR) is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern physics.
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Global Positioning System
The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Air Force.
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Greenwich Mean Time
Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London.
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International Astronomical Union
The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.
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International Atomic Time
International Atomic Time (TAI, from the French name temps atomique international) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid.
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International Celestial Reference Frame
In astrometry, an International Celestial Reference Frame (ICRF) is a realization of the International Celestial Reference System (ICRS) using reference celestial sources observed at radio wavelengths.
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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.
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International Meridian Conference
The International Meridian Conference was a conference held in October 1884 in Washington, D.C., in the United States, to determine a prime meridian for international use.
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International System of Units
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.
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International Telecommunication Union
The International Telecommunication Union (ITU; Union Internationale des Télécommunications (UIT)), originally the International Telegraph Union (Union Télégraphique Internationale), is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies.
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International Terrestrial Reference System
The International Terrestrial Reference System (ITRS) describes procedures for creating reference frames suitable for use with measurements on or near the Earth's surface.
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Jet Propulsion Laboratory
The Jet Propulsion Laboratory (JPL) is a federally funded research and development center and NASA field center in Pasadena, California, United States, with large portions of the campus in La Cañada Flintridge, California.
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Julian day
Julian day is the continuous count of days since the beginning of the Julian Period and is used primarily by astronomers.
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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 as realized by UT1.
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List of international common standards
A list of common and basic information standards, that are related by their frequent and widespread use, and which are conventionally used internationally by industry and organizations.
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Map
A map is a symbolic depiction emphasizing relationships between elements of some space, such as objects, regions, or themes.
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Marine chronometer
A marine chronometer is a timepiece that is precise and accurate enough to be used as a portable time standard; it can therefore be used to determine longitude by means of celestial navigation.
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Moon
The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.
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Nautical chart
A nautical chart is a graphic representation of a maritime area and adjacent coastal regions.
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Nepal Standard Time
Nepal Standard Time (NPT) is the time zone for Nepal.
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Newton's laws of motion
Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics.
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Planet
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
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Polar motion
Polar motion of the Earth is the motion of the Earth's rotational axis relative to its crust.
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Prime meridian (Greenwich)
A prime meridian, based at the Royal Observatory, Greenwich, in London, England, was established by Sir George Airy in 1851.
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Quasar
A quasar (also known as a QSO or quasi-stellar object) is an extremely luminous active galactic nucleus (AGN).
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Radar
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
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Rail transport
Rail transport is a means of transferring of passengers and goods on wheeled vehicles running on rails, also known as tracks.
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Royal Observatory, Greenwich
The Royal Observatory, Greenwich (ROG; known as the Old Royal Observatory from 1957 to 1998, when the working Royal Greenwich Observatory, RGO, moved from Greenwich to Herstmonceux) is an observatory situated on a hill in Greenwich Park, overlooking the River Thames.
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Sandford Fleming
Sir Sandford Fleming (January 7, 1827 – July 22, 1915) was a Scottish Canadian engineer and inventor.
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Sidereal time
Sidereal time is a timekeeping system that astronomers use to locate celestial objects.
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Solar time
Solar time is a calculation of the passage of time based on the position of the Sun in the sky.
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Standard time
Standard time is the synchronization of clocks within a geographical area or region to a single time standard, rather than using solar time or a locally chosen meridian (longitude) to establish a local mean time standard.
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Standard Time Act
The Standard Time Act of 1918, also known as the Calder Act, was the first United States federal law implementing Standard time and Daylight saving time in the United States.
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Star
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
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Sun
The Sun is the star at the center of the Solar System.
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Telegraphy
Telegraphy (from Greek: τῆλε têle, "at a distance" and γράφειν gráphein, "to write") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message.
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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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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 standard
A time standard is a specification for measuring time: either the rate at which time passes; or points in time; or both.
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Time zone
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes.
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Train
A train is a form of transport consisting of a series of connected vehicles that generally runs along a rail track to transport cargo or passengers.
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United States Naval Observatory
The United States Naval Observatory (USNO) is one of the oldest scientific agencies in the United States, with a primary mission to produce Positioning, Navigation and Timing (PNT) for the United States Navy and the United States Department of Defense.
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Unix time
Unix time (also known as POSIX time or UNIX Epoch time) is a system for describing a point in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970,.
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Very-long-baseline interferometry
Very-long-baseline interferometry (VLBI) is a type of astronomical interferometry used in radio astronomy.
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Redirects here:
UT0, UT1, UT1R, UT2, UT2R, UTC-SLS, Universal Standard Time, Universal Time (UT), Universal time, Ut1.
References
[1] https://en.wikipedia.org/wiki/Universal_Time
