# Al-Khawarizmi

**Mohammad Bin Musa Al-Khawarizmi**(~800 A.D. to ~840 A.D.) practised mathematics, astronomy and geometry.

Table of contents |

2 Interesting Contributions 3 External Links |

## 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

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