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View synonyms for sidereal day
sidereal day
noun
, Astronomy.
- the interval between two successive passages of the vernal equinox over the meridian, being about four minutes shorter than a mean solar day.
sidereal day
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Word History and Origins
Origin of sidereal day1
First recorded in 1785–95
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Example Sentences
This 5th day is the sidereal day of the astronomers and is the basis of our time, so it is entitled to a little attention.
From Project Gutenberg
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