Published in the Wall Street Journal, Jan. 26, 2016 7:24 p.m. ET
Science, Sorcery and Sons
Kepler believed in witches. He probably even wondered about the potions his mother brewed. But when she was accused, he came to her aid.
More than 300 years after Salem’s famous trials, American popular culture remains preoccupied with the supposed witches of 17th-century Massachusetts. But we do not hear much about the women accused of witchcraft across the ocean during the same period in Württemberg, Germany. In “The Astronomer and the Witch: Johannes Kepler’s Fight for his Mother,” Ulinka Rublack, a professor of early modern history at the University of Cambridge, introduces us to one of these witches, Katharina Kepler, who was tried in Württemberg in 1615-21.
Katharina was the mother of Johannes Kepler, a key figure in the Scientific Revolution that had begun to sweep Europe. In 1609, as court astronomer to Emperor Rudolph II of Prague, Johannes used the remarkable naked-eye observations of his predecessor Tycho Brahe to discover that the planets orbit the sun in paths that are elliptical—overthrowing the belief in circular orbits that had held since Aristotle’s time and strengthening the arguments for a heliocentric universe. Johannes was a deeply religious Lutheran whose scientific work was imbued with spiritual beliefs. He cast horoscopes, listened to the “music of the spheres” and understood the cosmos to be a living organism possessed of a soul. Like most people of his time, he believed in the existence of witches.