Jacob ben Tibbon is also known as Prophatius. He was a distinugished Jewish medical man who worked in the medical faculty of the University of Monpellier. He was the grandson of Samuel ben Judah ibn Tibbon who is famed as a translator.
Jacob ben Tibbon is himself known as a translator as well as a mathematician and an astronomer. He translated into Hebrew many Arabic versions of Greek works, Euclid's Elements, Ptolemy's Almagest as well as certain Arabic works by al-Ghazali and others.
He wrote Jacob's Quadrant in which he describes a quadrant of his own invention. This work contains a table of 11 fixed stars which are to be used in the construction of the instrument.
Jacob ben Tibbon also wrote Luhot (Tables) a book of astronomical tables giving ascensions of certain stars at Paris. These tables are mentioned in Dante's Divine Comedy. The Italian astronomer Andalo di Negro wrote Canones Super Almanach Profatii in 1323 which dealt with Jacob ben Tibbon's tables in Luhot.
Another work by Jacob ben Tibbon was Almanach Perpetuum which, as the title indicates, was a work on the almanac.
Tibbon's work was used by Copernicus in forming his theories.