| ephemeris time n. A highly accurate astronomical system for the measurement of time based on the period of Earth's orbit, but in practice relying on lunar observations and an accurate lunar ephemeris. |
| ephemeris time A highly accurate astronomical system for the measurement of time based in theory on the period of Earth's orbit, but in practice relying on lunar observations and an accurate lunar ephemeris so as to not be subject to the irregularities of Earth's rotation. The year 1900 CE is considered a standard year, containing 31,556,925.9747 seconds of ephemeris time. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  ephemeris 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 motionsastronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole time unit, unit of time - a unit for measuring time periods |
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