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ephemeris time is a noun 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". It carries one recorded sense.
(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
astronomy
Definitions, synonyms and semantic relations for ephemeris time come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.