A Sense of Where We Are
Earth in Motion. Rotation: 24 hrs. CCW about north pole. 750 mi/hr at State College. Night/day. Revolution: 365.25 days. CCW about north pole. Avg. speed: 67,000 mi/hr. Orientation of Earth in Space. 23.5o tilt of polar (rotational) axis. Precession: 26,000 yrs ‘Wobble’ of Earth’s polar axis. Due to gravity of Moon and Sun ................
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