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Sidereal Day
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How long does it take the Earth to spin? Hint: it is NOT 24 hours. Time-lapse photography of stars at night reveals the true period of the Earth's spin. Watch the clock as the Earth completes a full turn and returns distant stars to the same place in the sky.
A "sidereal day" is the length of time required for a distant star to appear at the same place in the sky as it was yesterday. This is less than a "solar day" -- the time from local noon to local noon. The Earth has to spin a bit more to return the Sun overhead each day than it does a distant star because the Sun is in a different place each day while distant stars are fixed on the "celestial sphere".
Images in this video were taken from the North and East-facing HPWREN cameras as well as the all-sky camera at the Mount Laguna Observatory in East San Diego County.
A "sidereal day" is the length of time required for a distant star to appear at the same place in the sky as it was yesterday. This is less than a "solar day" -- the time from local noon to local noon. The Earth has to spin a bit more to return the Sun overhead each day than it does a distant star because the Sun is in a different place each day while distant stars are fixed on the "celestial sphere".
Images in this video were taken from the North and East-facing HPWREN cameras as well as the all-sky camera at the Mount Laguna Observatory in East San Diego County.
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