Definition of mean solar day in English:

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mean solar day

noun

Astronomy
The time between successive passages of the mean sun across the meridian.
Example sentences
  • It no longer made sense to define the second as 1 / 86,400th of a mean solar day.
  • The second was defined to be 1 / 86,400 of the mean solar day, the average rotational period of the earth with respect to the Sun.
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