terrestrial time

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Noun1.terrestrial time - (astronomy) a measure of time defined by Earth's orbital motionterrestrial time - (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
ephemeris time, TDT, terrestrial dynamical time, TT
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
time unit, unit of time - a unit for measuring time periods
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References in periodicals archive
In 1984 ET was replaced by Terrestrial Dynamical Time (TDT); the name was shortened in 1991 to Terrestrial Time (TT).
Civilization at large, not just astronomers, needs a smoothly running time system like Terrestrial Time. But most of humanity is also tied to the natural cycle of the day, variable though it may be.
Time and the amateur astronomer
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