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Definitions:
Noun
terrestrial time
TT
terrestrial dynamical time
TDT
ephemeris time
Definition: (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
Definition: A former standard astronomical time scale intended to overcome the drawbacks of irregularly fluctuating mean solar time, superseded in the 1970s.