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solar day

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solar day [′sō·lər ′dā]
(astronomy)
A time measurement, the duration of one rotation of the earth on its axis with respect to the sun; this may be a mean solar day or an apparent solar day as the reference is to the mean sun or apparent sun.
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Light and dark patterns are the major synchronizer of circadian rhythms to the 24-hour solar day," said Dr Mariana Figueiro, Lighting Research Center Light and Health Program director and principal investigator on the project.
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Historically, the second was simply defined in terms of the rotation of the Earth as 1/86 400 of a mean solar day which means that the Earth's rotation was effectively the timebase.
Another positive Leap Second was introduced on 31 December 2008 by Monthly Notes of the Astronomical Society of Southern Africa
 
 
 
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