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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.
Relate Cause and Effect Explain how the motion of Earth causes day and night. day/night cycle and the apparent movement of the Sun across the sky. â¢ Earth rotates from west to east. â¢ As Earth turns, the sun appears to move west across the sky. day/night cycle and the apparent movement of the Sun across the sky.