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Soon after a bright light blazed in the sky in 1604, Johannes Krabbe declared that he had accurately predicted it down to the month and year. From the royal court at Wolfenbüttel, Krabbe measured the magnitude and motion of the comet “beyond the sphere of Saturn.” Krabbe represented a growing number of astronomers who projected the principle of parallax to the heavens, abolishing the solid celestial spheres and countering the cometary theory of Aristotle.
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In the following presentation, I examine the career and cosmology of Krabbe, including his conflict with Johannes Kepler, who defined the comet as a new star deprived entirely of parallax. While Krabbe considered novel ideas about the physical nature of the heavens, his account reflected a relatively standard view of astrology across Lutheran Germany. Despite uncertainty in the science of the stars, Krabbe held out hope for the future. “Wise astrologers will one day determine the causes for why comets appear,” he concluded.
