# Jabir ibn Aflah

**Abu Muhammad Jabir ibn Aflah** (Arabic: أبو محمد جابر بن أفلح, 1100 in Seville, Spain – 1150) was an Arab Muslim astronomer, mathematician and inventor whose works, once translated into Latin (under his Latinized name **Geber**), influenced later European mathematicians and astronomers.^{[1]}^{[2]} He invented an observational instrument known as the torquetum, a mechanical device to transform between spherical coordinate systems.^{[3]}.Gerolamo Cardano noted much of the material of Regiomontanus on spherical trigonometry was plagiarised from the twelfth-century work of the Jäbir ibn AflaH^{[4]}.Similarly the trigonometry that Nicholas Copernicus (1473-1543) outlined in the first part of his epochal work De revolutionibus was also apparently inspired by Jabir ibnAflah^{[5]}

## Related

- List of Arab scientists and scholars

## References

**^**Muslims and the Moon**^**Jabir Ibn Aflah**^**Lorch, R. P. (1976), "The Astronomical Instruments of Jabir ibn Aflah and the Torquetum",*Centaurus***20**(1): 11–34, doi:**^**Victor J. Katz-Princeton University Press**^**Ivars Petersons MathTrek Mathematical Association of America