# Sidereal-time meaning

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_{24}of a sidereal day), the sidereal minute (

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_{60}of a sidereal hour), and the sidereal second (

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_{60}of a sidereal minute)

**sidereal day**is the time required for one complete rotation of the Earth on its axis with respect to a fixed star. It is an unvarying unit equal to 23 hours, 56 minutes, 4.09 seconds of solar time. &diamf3; A

**sidereal month**is the average period of revolution of the Moon around the Earth with respect to a fixed star, equal to 27 days, 7 hours, 43 minutes of solar time. &diamf3; A

**sidereal year**is the time required for one complete revolution of the Earth around the Sun with respect to a fixed star, equal to 365 days, 6 hours, 9 minutes, 9.54 seconds of solar time.