On whole number arithmetic; On fractional arithmetic; on astrology; on areas; on finding the unknowns [unknown variables]. He also wrote a "Thesis on the sine and the chord"; "thesis on the circumference" in which he found the ratio of the circumference to the radius of a circle to sixteen decimal places; "The garden of gardens" or "promenade of the gardens" describing an instrument he devised and used at the Samarqand observatory to compile an ephemeris, and for computing solar and lunar eclipses; The ephemeris "Zayj Al-Khaqani" which also includes mathematical tables and corrections of the ephemeris by Al-Tusi; "Thesis on finding the first-degree sine". Seventeenth century Mathematics The Arabic mathematician Mohammed Baqir Yazdi discovered the pair of amicable numbers 9,363,584 and 9,437,056 for which he is jointly credited with Descartes. Eighteenth century A 17th century celestial globe was made by Diya’ ad-din Muhammad in Lahore, 1663 (now in Pakistan). It is now housed at the National Museum of Scotland. It is encircled by a meridian ring and a horizon ring. The latitude angle of 32° indicates that the globe was made in the Lahore workshop. This specific 'workshop claims 21 signed globes—the largest number from a single shop’ making this globe a good example of Celestial Globe production at its peak. See also Arab Agricultural Revolution Islamic Golden Age Science in the medieval Islamic world Ibn Sina Academy of Medieval Medicine and Sciences List of inventions in the medieval Islamic world References Citations Sources Donald Routledge Hill and Ahmad Y Hassan (1986), Islamic technology–an illustrated history, . External links Qatar Digital Library - an online portal providing access to previously undigitised British Library archive materials relating to Gulf history and Arabic science "How Greek Science Passed to the Arabs" by De Lacy O'Leary St-Andrew's chronology of mathematics Science in the medieval Islamic world + Science timelines Technology timelines