Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun ephemeris_time

1 sense of ephemeris time

Sense 1
terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris 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)
       => time unit, unit of time -- (a unit for measuring time periods)