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：2025/11/28
sidereal day
（ plural ）
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(astronomy) One day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox (about 23 hours, 56 minutes, 4 seconds).
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sidereal day
A sidereal day is slightly shorter than a solar day, which affects precise astronomical observations.
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A sidereal day is slightly shorter than a solar day, which affects precise astronomical observations.
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