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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.
Heliotropism, also known as solar-tracking, is the diurnal motion of plant leaves and flowers in response to the direction of the sun. Many studies of solar-tracking plants indicate that heliotropism is correlated with higher light absorption, photosynthetic efficiency, and crop productivity.