S13.4.6

Knows that gravity is a universal force that each mass exerts on any other mass; the strength of the gravitational attractive force between two masses is proportional to the masses and inversely proportional to the square of the distance between them.

Why Is There a Tidal Bulge Opposite the Moon?

Demonstrate and calculate the reasons for tidal bulges of water on both hemispheres of Earth, due to the Moon.

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The Moon Orbits the Sun?!?!

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?

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