| 释义 |
sidereal yearn.（名词）- The time required for one complete revolution of the earth about the sun, relative to the fixed stars, or 365 days, 6 hours, 9 minutes, 9.54 seconds in units of mean solar time.恒星年：以固定恒星为参照物，地球围绕太阳公转一整周所需要的时间，用标准太阳时单位计为365天6小时9分9.54秒
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