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2017 Word of the Year

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. 2017.
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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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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