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Laws
of Orbits, Gravity
-
Kepler's
Three Laws
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Planets
orbit Sun in an ellipse
with the Sun at one focus
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A line
joining the planet to the Sun sweeps out equal
areas in equal
intervals of time
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P2
= a3 (Period,
semi major axis
--good for Sun only)
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Newton's
universal law of gravitation
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m1,
m2 masses of objects
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R
separation distance
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G = 6.67 x 10-11
newton m2/kg2
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Newton's
form of Kepler's 3rd law (good anywhere)
Elliptical
orbit
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