| 单词 | tropical year |
| 释义 | tropical year [`träp·ǝ·kǝl `yir] ASTRONOMY A unit of time equal to the period of one revolution of the earth about the sun measured between successive vernal equinoxes; it is 365.2422 mean solar days or 365 days 5 hours 48 minutes 46 seconds. Also known as astronomical year. |
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