| 单词 | ephemeris time |
| 释义 | ephemeris time (extremely rare) n WORD FAMILY ephemeris time n (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 Syn|Hyper TDT, TT, terrestrial dynamical time, terrestrial time time unit, unit of time a unit for measuring time periods |
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