Medieval chart of the decemnovenale cycle

Medieval chart of the decemnovenale cycle

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Credit: Renaissance and medieval manuscripts collection/NEW YORK PUBLIC LIBRARY/ SCIENCE PHOTO LIBRARY

Caption: Medieval chart of the decemnovenale cycle. 1230 extract from De sphaera mundi, by the Parisian astronomer and monk Johannes de Sacrobosco (circa 1195-1256), with a chart showing the decemnovenale cycle, the cycle of epacts, and the cycle of the 'claves.' De sphaera mundi is a short astronomy textbook that was widely read and influential in Europe as an introduction to astronomy. Sacrobosco is also known for writing a short introduction to the Hindu-Arabic numeral system, which became the most widely read introduction to the subject in the later mediaeval centuries. He also correctly described the defects of the then-used Julian calendar and recommended what was essentially the Gregorian calendar.

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Keywords: 1200s, 1230, 13th century, artwork, astronomical, astronomy, book, chart, cycle of epacts, cycle of the claves, de sphaera mundi, decemnovenale cycle, diagram, extract, french, historical, history, history of science, illustration, ioannis, johannes de sacrobosco, latin, manuscript, mediaeval, medieval, monk, no-one, nobody, parisian, planetary science, solar system, space, writing

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