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EvC Forum ⇒ Science Forums ⇒ Big Bang and Cosmology ⇒

Sun-Earth-Moon Gravity

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Topic: Sun-Earth-Moon Gravity

Coragyps

Member (Idle past 764 days)

Posts: 5553

From: Snyder, Texas, USA

Joined: 11-12-2002

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Message 15 of 119 (347812)
09-09-2006 4:41 PM

Reply to: Message 14 by Ragged
09-09-2006 4:34 PM

Were my calculation wrong?

Must have been! Distance, as you say, is very nearly the same, and the Moon's mass is 0.0123 that of the Earth. So Sun-Moon attraction will be 0.0123 that of Sun-Earth.

As far as "cocktail-napkin" calculations, try this:

Earth-Moon attraction = 1 X 0.0123/1² = 0.0123

Earth-Sun attraction = 1 X 333,000/390² = 2.18

Moon-Sun = .0123 X 2.18 = 0.0269

Edited by Coragyps, : add calculations

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	Message 14 by Ragged, posted 09-09-2006 4:34 PM		Ragged has not replied

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