mean solar day
American Heritage Dictionary:
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mean solar day
n.
The period of time between two successive transits of the mean sun; the standard for the 24-hour day measured from midnight to midnight.
McGraw-Hill Dictionary of Aviation:
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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.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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