Question

how many hours are there in one mean solar day
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Answer 1

Explanation:

A Mean Solar Day is 24 hours. An apparent day may be between 20 to 30 seconds shorter or longer than this due to the effects above but obviously, for the sake of timekeeping, it is sensible to use an average. The mean sun is an imaginary sun which matches a mean solar day exactly.

Answer 2

12 hours are there in a solar day