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terrestrial$82450$ - translation to greek
![Arctic ice shrinkage]]s of 2007 compared to 2005 and also compared to the 1979–2000 average.](https://commons.wikimedia.org/wiki/Special:FilePath/2007 Arctic Sea Ice.jpg?width=200 "Arctic ice shrinkage]]s of 2007 compared to 2005 and also compared to the 1979–2000 average.")
![The German North Pole expedition 1990, Ski-Doo for local research on [[pack-ice]]](https://commons.wikimedia.org/wiki/Special:FilePath/Arctic World.jpg?width=200 "The German North Pole expedition 1990, Ski-Doo for local research on [[pack-ice]]")
![Participants of the first German North Pole expedition 1990 from [[University of Giessen]]](https://commons.wikimedia.org/wiki/Special:FilePath/Arctic World 05.jpg?width=200 "Participants of the first German North Pole expedition 1990 from [[University of Giessen]]")
![USS ''Charlotte'']] at the North Pole in 2005](https://commons.wikimedia.org/wiki/Special:FilePath/Chralotte Northpole.jpg?width=200 "USS ''Charlotte'']] at the North Pole in 2005")
![[[Gerardus Mercator]]'s map of the North Pole from 1595](https://commons.wikimedia.org/wiki/Special:FilePath/Mercator north pole 1595.jpg?width=200 "[[Gerardus Mercator]]'s map of the North Pole from 1595")
![the first ever manned descent to the seabed under the North Pole]]](https://commons.wikimedia.org/wiki/Special:FilePath/Mir front.jpg?width=200 "the first ever manned descent to the seabed under the North Pole]]")
![''Arktika'']], the first [[surface ship]] to reach the North Pole, 1977](https://commons.wikimedia.org/wiki/Special:FilePath/RIAN archive 186141 Nuclear icebreaker Arktika.jpg?width=200 "''Arktika'']], the first [[surface ship]] to reach the North Pole, 1977")
![Sunset over the North Pole at the [[International Dateline]], 2015](https://commons.wikimedia.org/wiki/Special:FilePath/Sunset over the North Pole at the International Date line at 20,000 feet Aug 6th 2015 by D Ramey Logan.JPG?width=200 "Sunset over the North Pole at the [[International Dateline]], 2015")
![USS ''Skate'']] at drift station Alpha, 1958](https://commons.wikimedia.org/wiki/Special:FilePath/USS Skate (SSN-578) surfaced in Arctic - 1959.jpg?width=200 "USS ''Skate'']] at drift station Alpha, 1958")
.gif?width=200 "Original major radio broadcasting networks in the United States")
Definition
Wikipedia
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. For example, the Astronomical Almanac uses TT for its tables of positions (ephemerides) of the Sun, Moon and planets as seen from Earth. In this role, TT continues Terrestrial Dynamical Time (TDT or TD), which succeeded ephemeris time (ET). TT shares the original purpose for which ET was designed, to be free of the irregularities in the rotation of Earth.
The unit of TT is the SI second, the definition of which is based currently on the caesium atomic clock, but TT is not itself defined by atomic clocks. It is a theoretical ideal, and real clocks can only approximate it.
TT is distinct from the time scale often used as a basis for civil purposes, Coordinated Universal Time (UTC). TT is indirectly the basis of UTC, via International Atomic Time (TAI). Because of the historical difference between TAI and ET when TT was introduced, TT is approximately 32.184 s ahead of TAI.
