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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.
Rhythm (from Greek á¿¥ÏÎ¸Î¼ÏÏ, rhythmos, any regular recurring motion, symmetry  (Liddell and Scott 1996)) generally means a  movement marked by the regulated succession of strong and weak elements, or of opposite or different conditions (Anon. 1971, 2537).