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" A solar day is the interval between two successive passages of the sun across the meridian of any place. If the earth were stationary in its orbit, the solar day would be of the same length as the sidereal ; but while the earth is turning around on its... "
Fourteen Weeks Course in Descriptive Astronomy - Page 289
by Joel Dorman Steele - 1876 - 336 pages
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A Primer of Astronomy

...life for we must regulate our hours by the Sun. It might therefore seem natural to take as our day the interval between two successive passages of the Sun across the meridian. This interval is however not a constant one, but if we take a very great number of such intervals between...
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