1 mean solar day=_______s

864000

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86400

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8640

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Solution

The correct option is B
86400

A solar day is a time it takes for the Earth to rotate about its axis so that the Sun appears in the same position in the sky.
Which is equal to 24 hr 03 min 55 s, i.e. in total, 86636 seconds.
One mean solar day is equal to 86400 seconds.
Hence option B is correct.

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