Kepler's laws
Kepler's laws are the following:
KI: All planets move on elliptical
(not circular) orbits, with the Sun at one focus.
KII: A line joining any planet to the
Sun sweeps out equal areas in equal times.
KIII: The square of the period
of any planet about the Sun is proportional
to the cube of the planet's mean distance
from the Sun.
Well, that's nice. But what does it mean?
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