sidereal day
nounAstronomy.
the interval between two successive passages of the vernal equinox over the meridian, being about four minutes shorter than a mean solar day.
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Origin of sidereal day
1First recorded in 1785–95
Words Nearby sidereal day
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use sidereal day in a sentence
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.
Time and Its Measurement | James Arthur
British Dictionary definitions for sidereal day
sidereal day
noun
See day (def. 5)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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