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"Sidereal" time is based on the stars.

The Earth actually turns 360 degrees in 23 hours, 56 minutes and a few seconds. So why do we say that a "day" is 24 hours?

Because in the 23 hours and 56 minutes that it takes the Earth to rotate once, the Earth has moved in its orbit so far that it takes another 4 minutes for the Earth to turn enough to point to the Sun again.

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15y ago
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4mo ago

The time based on the stars is called Sidereal time, which is measured by the position of a particular star relative to the observer's meridian. It is used by astronomers to coordinate their observations and measurements.

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Q: What is time based on stars called?
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How sumerians keep time?

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what improved the ability to determine latitude and longitude based on the stars