Question

what is mean solar day and how many seconds are there???​

Answer 1

Answer:

The "mean solar day" is the time for one Earth rotation with respect to the mean Sun.For example, data show that Earth body tides brought the mean solar day through 86,400 SI seconds on 6 different dates in the year 2009.

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Answer 2

A solar day is the time it takes for the Earth to rotate about its axis so that the Sun appears in the same position in the sky. Although a simple definition of a day is the time it takes for a planet, satellite or other celestial body to complete one rotation about its axis, two alternative definitions exist.

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