Did a medieval Jewish philosopher invent the scientific method centuries before Karl Popper?

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: Levi ben Gershon, known as Gersonides, was a 14th-century polymath who challenged the astronomical dogmas of his time. By treating celestial models as testable hypotheses rather than absolute truths, he pioneered an early form of falsificationism, using his own custom-built instruments to systematically dismantle the long-standing Ptolemaic system.

Born in 1288 in Languedoc, France, Gersonides was a prolific philosopher, mathematician, and astronomer. His magnum opus, The Wars of the Lord, composed between 1317 and 1329, sought to reconcile Aristotelian logic with Jewish thought. Unlike many of his contemporaries, Gersonides adhered strictly to Aristotelianism, a stance that led him to rationalize biblical miracles and propose controversial theological views, such as the idea that God possesses limited foreknowledge of human moral choices to preserve free will.

Gersonides' scientific contributions were equally radical. In 1321, he authored Maaseh Hoshev, a mathematical treatise notable for its early, systematic use of mathematical induction and pioneering work in combinatorics. As an astronomer, he invented the Jacob's staff to measure celestial distances and utilized a camera obscura to observe the Sun and Moon. His observations of the 1335 and 1337 eclipses provided empirical data that he used to challenge the prevailing Ptolemaic model of epicycles, marking a rare instance of early modern falsification philosophy.

Perhaps most strikingly, Gersonides was the only pre-modern astronomer to estimate that fixed stars were vastly further away than planets, placing them at roughly 100,000 light-years in modern units. Despite these profound insights, his influence remained limited because he wrote primarily in Hebrew. While his work was translated for figures like Pope Clement VI in 1342, there is little evidence his findings reached later generations of astronomers, leaving his role as a precursor to the scientific revolution largely unrecognized for centuries.

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