HyperDic: tdt

English > 1 sense of the word TDT:
NOUNtimeTDT, terrestrial time, TT, terrestrial dynamical time, ephemeris time(astronomy) a measure of time defined by Earth's orbital motion
English > TDT: 1 sense > noun 1, time
Meaning(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.
Synonymsterrestrial time, TT, terrestrial dynamical time, ephemeris time
Categoryastronomy, uranologyThe branch of physics that studies celestial bodies and the universe as a whole
Broadertime unit, unit of timeA unit for measuring time periods
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