What is the stellar day?

23 h 56 min 05 s
24 h 10 min 07 s
25 h 22 min 09 s
26 h 05 min 11 s
Sidereal time is a time-keeping system astronomers use to keep track of the direction to point their telescopes to view a given star in the night sky. It is a time scale that is based on the Earth's rate of rotation measured relative to the fixed stars rather than the Sun.
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Krzysztof Moskal
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