- an imaginary sun moving along the celestial equator at a constant rate and completing its annual course in the same time as the sun takes to move round the ecliptic at a varying rate. It is used in the measurement of mean solar time
| 单词 | mean sun |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 mean′ sun′, [Astron.]
Collins Concise English Dictionary © HarperCollins Publishers:: mean sun n
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