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From Wikipedia, the free encyclopedia. Diurnal motion (Latin diurnus â²dailyâ², from dies â²dayâ²) is an astronomical term referring to the apparent daily motion of stars around the Earth, or more precisely around the two celestial poles.
Meaning of âdiurnalâ in the English Dictionary. diurnal in British English. diurnaladjective. But he probably neglected to keep diurnal notes. Of the former they have no measure but the visible diurnal motion of the sun or the monthly revolution of the moon. The diurnal revolution of the earth brings the joyful sunrise and the pathetic sunset.