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diurnal motion

noun, Astronomy
1.
the apparent daily motion, caused by the earth's rotation, of celestial bodies across the sky.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for diurnal motion

diurnal motion

noun
1.
motion that occurs during the day or daily, such as the diurnal rotation of the celestial sphere
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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