Mean Solar Day
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Mean Solar Day
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The duration of one rotation of
the earth on its axis, with respect to the mean sun.
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The length of the mean solar days is 24 hours of mean solar time or 24
hours 3 minutes 56.555 seconds of mean sidereal time. A mean solar day
beginning at midnight is called a civil day; and one beginning at noon,
12 hours later, is called an astronomical day. See calendar
day.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
