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.
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
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
So the solar day is about 4 minutes longer than the sidereal day.
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 Second is the time of one swing of a pendulum making 86,164.09 swings in a sidereal day, or 1/86,400 part of a mean solar day.
From The Story of Electricity by Munro, John
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.
