divides the prime vertical into equal 30° arcs, or houses, is often attributed to him but the method is known to have been described by others before his time. Bibliography Elementa, 1255–1259 Theorica planetarum, 1261–1264 Computus maior, 1268 Tractatus de sphera, after 1268 De quadratura circuli De quadrante Tres circulos in astrolapsu descriptos... Tractatus de astrologia indicaria References External links 1296 deaths Italian astrologers 13th-century Italian mathematicians People from Novara 1220s births 13th-century astronomers 13th-century Italian writers 13th-century astrologers 13th-century Latin writers 13th-century translators