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OpenStudy (anonymous):

How has our knowledge of planetary motion changed over time?

OpenStudy (gatorgirl):

First two things I would compare would be Copernicus' model of the solar system, and Johannes Kepler's model of the solar system. We still say Copernicus is the "father of heliocentricity" but Kepler's more accurate model cannot be ignored.

OpenStudy (gatorgirl):

Hope it helped :)

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