 ephemeris_time |
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| 1. | [ noun ] (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: | TT terrestrial_dynamical_time TDT terrestrial_time | |
| Related terms: | time_unit astronomy | |
| Similar spelling: |
Ephemeridae ephemerality Ephemeroptera ephemeralness ephemeropteran |
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