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Line 11:
Line 11: − The orbits of planets observable in Kepler's times were very circular. Comets, on the other hand, have highly eccentric [[orbit]]s with only one focal point inside the sun.
move sentence about comets et al. to Orbit
Ellipses became important in [[astronomy]] in the early 1600s, when [[Kepler]] proved that planets revolving the sun always follow elliptical [[orbit]]s. This helped overturn the [[Ptolemaic theory]], and led to [[Issac Newton]]'s [[law of gravitation]].
Ellipses became important in [[astronomy]] in the early 1600s, when [[Kepler]] proved that planets revolving the sun always follow elliptical [[orbit]]s. This helped overturn the [[Ptolemaic theory]], and led to [[Issac Newton]]'s [[law of gravitation]].
[[category:geometry]]
[[category:geometry]]