Famous Works Al-Jabr wa-al-Muqabilah from whose title came the name "Algebra" Kitab al-Jam'a wal-Tafreeq bil Hisab al-Hindi (on Arithmatic, which survived in a Latin translation but was lost in the original Arabic) Kitab Surat-al-Ard (on geography) Istikhraj Tarikh al-Yahud (about the Jewish calendar) Kitab al-Tarikh Kitab al-Rukhmat (about sun-dials) Interesting Contributions Explained the use of zero Developed tables containing the sine functions Perfected the geometric representation of conic sections Calculus of two errors Revised Ptolemy's views on geography External Links " class="external">http://members.tripod.com/~wzzz/KHAWARIZ.html This article is a stub. You can help Wikipedia by fixing it.