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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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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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
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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