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Earth's rotation - wikipedia, the free encyclopedia, 1 history. 1.1 empirical tests; 2 rotation period. 2.1 true solar day; 2.2 mean solar day; 2.3 stellar and sidereal day; 2.4 angular speed; 3 changes in rotation. 3.1. Earth's rotation - iowa state university, Earth's rotation. earth's rotation and the apparent daily motion of the sky . the earth rotates about an imaginary line that passes through the north. Tidal acceleration - wikipedia, the free encyclopedia, Effects of moon's gravity . because the moon's mass is a considerable fraction of that of earth (about 1:81), the two bodies can be regarded as a double planet system.
Daily motions - university of oregon, Daily motions. the daily (diurnal) motion of the celestial objects is caused by the rotation of the earth on its axis. we see the stars rise in the east, set in the.