“I was almost driven to madness in considering and calculating this matter. I could not find out why the planet would rather go on an elliptical orbit. Oh, ridiculous me!”

— Johannes Kepler , book Astronomia nova

Source: Astronomia nova (1609), Ch.58, as quoted in John Freely, Before Galileo: The Birth of Modern Science in Medieval Europe (2012)
Context: I was almost driven to madness in considering and calculating this matter. I could not find out why the planet would rather go on an elliptical orbit. Oh, ridiculous me! As the liberation in the diameter could not also be the way to the ellipse. So this notion brought me up short, that the ellipse exists because of the liberation. With reasoning derived from physical principles, agreeing with experience, there is no figure left for the orbit of the planet but a perfect ellipse.

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Johannes Kepler 51

German mathematician, astronomer and astrologer 1571–1630

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“I was almost driven to madness in considering and calculating this matter. I could not find out why the planet would rather go on an elliptical orbit. Oh, ridiculous me! As the liberation in the diameter could not also be the way to the ellipse. So this notion brought me up short, that the ellipse exists because of the liberation. With reasoning derived from physical principles, agreeing with experience, there is no figure left for the orbit of the planet but a perfect ellipse.”

Johannes Kepler book Mysterium Cosmographicum

As translated and quoted in John Freely, Before Galileo: The Birth of Modern Science in Medieval Europe (2012), in chapter 58, at an unspecified page.
Mysterium Cosmographicum (1596), Astronomia nova (1609)

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