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