The time between successive passages of the mean sun across the meridian.
- 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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Syllabification: mean so·lar day
Definition of mean solar day in:
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