mean solar day


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Related to mean solar day: mean solar time
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Synonyms for mean solar day

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References in periodicals archive ?
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.
No longer is a second exactly 1/86,400 of a mean solar day. Since 1967 the second has been defined as how long cesium-133 atoms take to emit 9,192,631,770 cycles of a certain microwave radiation in an atomic clock.