John of London (),

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

, was described by

Roger Bacon Roger Bacon (; la, Rogerus or ', also '' Rogerus''; ), also known by the scholastic accolade ''Doctor Mirabilis'', was a medieval English philosopher and Franciscan friar who placed considerable emphasis on the study of nature through empiri ...

as one of two "perfect" mathematicians, together with Pierre de Maricourt. Bacon probably knew John in Paris in the 1260s. No works are certainly attributed to him, but he may be the author of an influential table of stellar coordinates. He may also be the 'Master John of London' who designed a form of

astrolabe An astrolabe ( grc, ἀστρολάβος ; ar, ٱلأَسْطُرلاب ; persian, ستاره‌یاب ) is an ancient astronomical instrument that was a handheld model of the universe. Its various functions also make it an elaborate inclin ...

and was described by Roger of Lincoln as ''astronomus famosus'' (‘renowned astronomer’).

Notes

{{DEFAULTSORT:John of London 13th-century English people 13th-century English mathematicians Year of birth unknown Year of death unknown Medieval English mathematicians