Introduction Kepler's New Astronomy Three Models Kepler's Departure Finding "Oppositions" The "Mean" Sun Twelve Observations Ptolemy's "Equant" A "Vicarious Hypothesis" Earth's Motion An "Immaterial Species" Area-Time PrincipleAn Ellipse Conclusion On Proportion Recommended Books




Although Kepler's Astronmia Nova is widely recognized as one of the most important works of the Scientific Revolution, along with Copernicus' De Revolutionibus and Newton's Principia, it is also one of the least-studied due to its daunting size and technical complexity.

This web site seeks to introduce readers to the structure of the Astronomia Nova and key junctures in Kepler's argument. William H. Donahue's full translation of the Astronomia Nova (Cambridge, UK: Cambridge University Press, 1992) is available in university libraries.

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