Why is a sidereal day different from a solar day?
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A sidereal day is the time it takes for the Earth to rotate about its axis so that the distant stars appear in the same position in the sky. A solar dayis the time it takes for the Earth to rotate about its axis so that the Sun appears in the same position in the sky.
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Explanation:
The sidereal day is based on the successive passes of meridian across the vernal equinox, while solar day is a measure based on the successive passes of the sun.
• Solar day is about 4 minutes longer than the sidereal day.
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