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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.
1 The center of the universe is near the Sun. 2  Around the Sun, in order, are Mercury, Venus, Earth and Moon, Mars, Jupiter, Saturn, and the fixed stars. 3  The Earth has three motions: daily rotation, annual revolution, and annual tilting of its axis. 4  Retrograde motion of the planets is explained by the Earth's motion.