Sandivogius of Czechel

Sandivogius of Czechel (; c. 1410– 1476) was a Polish astronomer and cartographer. He was a professor and Stobner Chair at the Kraków Academy. He is known for providing a precise orbit of the Moon by introducing an additional epycicle in the geocentric model.

Life Probably born in Czechel in the Kingdom of Poland.

He enrolled Kraków Academy in 1423. After graduating, he taught astronomy there from 1429 to 1431, he held the special astronomy Stobner Chair (named after medieval scholar Nicholas Stobner). He worked on revising the Alfonsine tables, that were considered inaccurate by the academy.

Sandivogious also taught optics, based on the ideas of John Peckham. He wrote a popular a commentary to Peckham's Perspective communis. Sandivogius was a perspectivist, he aligned himself with Ibn al-Haytham and Vitello.

In 1431, Sandivogius left Cracow. He kept correspondence with his friend and historian Jan Długosz, who kept him in close contact with the academy. Between 1443 and 1444 he studied in the College of Navarre in Paris, where he offered a copy of his Code.

He also wrote Algorismus minutiarium and Algorismus proportionum.