sidereal day
Americannoun
noun
Etymology
Origin of sidereal day
First recorded in 1785–95
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
So the solar day is about 4 minutes longer than the sidereal day.
From Textbooks ● Oct. 13, 2016
However, astronomers also use a sidereal day, which is defined in terms of the rotation period of Earth with respect to the stars.
From Textbooks ● Oct. 13, 2016
In a part of Earth’s orbit where Earth is moving faster than usual around the Sun, would the length of the sidereal day change?
From Textbooks ● Oct. 13, 2016
Up to the mid-20th century, the sidereal day, the period of the earth’s rotation on its axis in relation to the stars, was used to determine standard time.
From Scientific American ● Dec. 31, 2011
The sidereal day and the mean solar day necessitate some means of registering time, such as clocks; therefore the original day in use must have been the apparent solar day.
From The Astronomy of the Bible An Elementary Commentary on the Astronomical References of Holy Scripture by Maunder, E. Walter (Edward Walter)
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
