Even the most casual observers note the changes in the phase of the Moon as it goes from crescent to half to full and back again with a “monthly” cycle. (See Glenn Simonelli’s PUMAS submission “Modeling the motions of the Earth, Sun and Moon” [PUMAS Example 03_10_04_1].) Their observations, or what is “common knowledge”, lead them to believe the Moon does loops around the Earth. But is this true? A comparison of the gravitational forces of the Sun and Earth on the Moon hints at the answer to this question and a simple demonstration refutes the loop-view.
Author(s): Stephen J. Edberg
PUMAS ID: 08_19_05_1
Date Received: 2005-08-19
Date Revised: 2005-10-21
Date Accepted: 2005-10-21
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