| NOUN | time | ephemeris time, terrestrial time, TT, terrestrial dynamical time, TDT | (astronomy) a measure of time defined by Earth's orbital motion |
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| Meaning | (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. | |
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| Synonyms | terrestrial time, TT, terrestrial dynamical time, TDT | |
| Category | astronomy, uranology | The branch of physics that studies celestial bodies and the universe as a whole |
| Broader | time unit, unit of time | A unit for measuring time periods |
| Catalan | temps d'efemèrides, temps terrestre | |
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