Example image of eyePlorer eyePlorer map for 'Omar Khayyám': Astronomy in medieval Islam Iran Islamic philosophy Mathematics in medieval Islam Medicine in medieval Islam Nishapur Persian literature Persian people Polymath Geography and cartography in medieval Islam Mechanics Music Circle Hyperbola Calendar reform Heliocentrism Nicolaus Copernicus Al-Zamakhshari Avicenna Iranian architecture Thomas Hyde Afghanistan Balkh Sheik Greater Khorasan Mathematician Binomial coefficient Pascal's triangle Euclid Thābit ibn Qurra Alhazen Non-Euclidean geometry Geometry Continued fraction Parallel postulate Begging the question Objection (argument) Cubic function Line segment Number Quadrant Radius Surface normal Altitude (triangle) Hypotenuse Right triangle Conic section Saccheri quadrilateral Aristotle Giordano Vitale