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Apparent solar day, mean solar day and a sidereal day

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What is difference between apparent solar day, mean solar day and a sidereal day?

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The unit of time is the second to which all time measuring devices are ultimately referred. The measure of time is commonly understood to be the time taken by the Earth to complete its orbit round the Sun.

The civil year has an average value of 365.2425 mean solar days. The sidereal year equals 365.2564 mean solar days.

Local Mean Solar Time and Universal Time: The Earth is divided into 24 different time zones approximately 15 degrees of longitude apart. The local mean solar time in each zone differs by one ...

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