Sacrobosco
Johannes de Sacrabosco (John of Holywood, 1195 - 1256) was an English geometrist.
He was born in Halifax, England and educated at Oxford University. In 1220, Sacrobosco went to Paris to continue his studies. After he arrived in Paris, Tractatus de Sphaera was published. In this first book, Sacrobosco discussed the place of Earth in the Universe. About a year after his arrival in the city, on June 5, 1221, he became a professor of mathematics at the University of Paris. Sacrobosco was a strong proponent of Arabic methods of mathematics.
What Sacrobosco may be most famous for is his criticism of the Julian Calendar. In his book De Anni Ratione, he maintained that the Julian Calendar was ten days off and that some correction was needed. His plan to fix it was to skip one day every 288 years.
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