Editing Spherical geometry (section)

===Islamic world===
{{See also|Mathematics in medieval Islam}}
''The Book of Unknown Arcs of a Sphere'' written by the Islamic mathematician [[Al-Jayyani]] is considered to be the first treatise on spherical trigonometry. The book contains formulae for right-handed<!--angled?--> triangles, the general law of sines, and the solution of a spherical triangle by means of the polar triangle.<ref>[http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Al-Jayyani.html School of Mathematical and Computational Sciences University of St Andrews]</ref>

The book ''On Triangles'' by [[Regiomontanus]], written around 1463, is the first pure trigonometrical work in Europe. However, [[Gerolamo Cardano]] noted a century later that much of its material on spherical trigonometry was taken from the twelfth-century work of the [[Al-Andalus|Andalusi]] scholar [[Jabir ibn Aflah]].<ref>{{Cite web |url=http://press.princeton.edu/chapters/i8583.html |title=Victor J. Katz-Princeton University Press |access-date=2009-03-01 |archive-date=2016-10-01 |archive-url=https://web.archive.org/web/20161001214903/http://press.princeton.edu/chapters/i8583.html |url-status=dead }}</ref>