terrestrial dynamical time

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Noun1.terrestrial dynamical time - (astronomy) a measure of time defined by Earth's orbital motionterrestrial dynamical 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 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).
Time and the amateur astronomer
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