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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.
What are circadian rhythms? Circadian rhythms are physical, mental and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness in an organism's environment. They are found in most living things, including animals, plants and many tiny microbes. The study of circadian rhythms is called chronobiology.