English noun: ephemeris time | |||
1. | ephemeris time (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 | ||
Synonyms | TDT, terrestrial dynamical time, terrestrial time, TT | ||
Broader (hypernym) | time unit, unit of time | ||
Domain category | astronomy, uranology | ||