| 释义 |
sidereal dayn.（名词）- The time required for a complete rotation of the earth in reference to any star or to the vernal equinox at the meridian, equal to 23 hours, 56 minutes, 4.09 seconds in units of mean solar time.恒星日：以任意恒星或以子午圈上的春分点为参照，地球自转一整周所需的时间，用标准太阳时单位表示相当于23小时56分钟4.09秒
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