mean solar day


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Related to mean solar day: mean solar time

mean solar day

[′mēn ′sō·lər ′dā]
(astronomy)
The duration of one rotation of the earth on its axis, with respect to the mean sun; the length of the mean solar day is 24 hours of mean solar time or 24h03m56.555sof mean sidereal time.

mean solar day

mean solar day
The period between two successive transits of a particular meridian on the earth by the astronomical mean sun. The length of a mean solar day is 24 h 3 min 56.555 s. It is divided arbitrarily into twenty-four units known as mean solar hours. Also called a civil day, mean day, or solar day.