Joannis Kepleri Astronomi Opera Omnia, Volume 4...

This is the fourth volume of the collected works of Johannes Kepler, one of the most important astronomers of the early modern period. The volume includes Kepler's famous 'Harmonices Mundi', a treatise on the music of the spheres, as well as his observations and calculations on the motion of the planets. It is a key source for the study of early modern astronomy and the development of the scientific worldview.
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