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Τι (ποιος) είναι terrestrial$82450$ - ορισμός

TIME STANDARD FOR ASTRONOMICAL OBSERVATIONS FROM THE EARTH
Terrestrial time; Terrestrial Dynamical Time; Terrestrial Dynamic Time; Terrestrial dynamic time; Terrestrial dynamical time

terrestrial         
WIKIMEDIA DISAMBIGUATION PAGE
Terristrial; Terrestrial environment; Terrestrial (disambiguation); Terrestriality
1.
Terrestrial means relating to the planet Earth rather than to some other part of the universe.
...terrestrial life forms.
ADJ: ADJ n
2.
Terrestrial television channels are transmitted using equipment situated at ground level, and not by satellite. (BRIT)
ADJ: usu ADJ n
terrestrial         
WIKIMEDIA DISAMBIGUATION PAGE
Terristrial; Terrestrial environment; Terrestrial (disambiguation); Terrestriality
[t?'r?str??l]
¦ adjective
1. on or relating to the earth or dry land.
(of an animal or plant) living on or in the ground.
2. denoting television broadcast other than by satellite.
3. Astronomy (of a planet) resembling the earth.
¦ noun an inhabitant of the earth.
Derivatives
terrestrially adverb
Origin
ME: from L. terrestris (from terra 'earth') + -al.
terrestrial         
WIKIMEDIA DISAMBIGUATION PAGE
Terristrial; Terrestrial environment; Terrestrial (disambiguation); Terrestriality
a.
Earthly, sublunary, mundane, worldly, terrene, subastral, subcelestial.

Βικιπαίδεια

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. 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.