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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.
Circadian rhythms are regular changes in mental and physical characteristics that occur in the course of a day (circadian is Latin for around a day). This clock, called thesuprachiasmatic nucleus or SCN (see figure 2 ), is actually a pair of pinhead-sized brain structures that together contain about 20,000 neurons.