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Lots of astronomical observations. Kepler derived his laws of planetary motion by fitting a math function to the observations assuming that the planets circled the sun in elliptical orbits. Later on, Newton proved Kepler's Laws from abstract mathematics.

2007-04-09 16:30:06 · answer #1 · answered by cattbarf 7 · 1 0

Accurate astronomical measurements of the known planets, their moons and the stars

2007-04-09 16:28:37 · answer #2 · answered by Matthew P 4 · 0 0

I agree with author Catbarf

2007-04-12 07:45:49 · answer #3 · answered by hilltopobservatory 3 · 0 0

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