(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
English: terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris time
TDT, TT, ephemeris time, terrestrial dynamical time, terrestrial time
English: terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris time