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What is the 4 min difference between solar & sidereal day related to?

April 26, 2017Astronomy difference Mathematics min sidereal solar

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What is the 4 min difference between solar & sidereal day related to?

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Solar day is the time to have the sun in the same meridian. Sidereal day is the time to have a star in the same meridian. While Earth is rotating around its axis it also is orbiting around the sun, so to see the sun in the same direction after a rotation the Earth need a further time because meanwhile it is in another position in its orbit.