Sullam al-sama', also known as Resaleh-ye Kamaliyyeh (Arabic*: سُلَم السماء, Transliterated as Sǒllam os-Samā'), meaning "The Ladder of the Sky" or "The...

coordinate system to the equatorial coordinate system. He wrote the book Sullam al-sama' on the resolution of difficulties met by predecessors in the determination...

appeared on the Australian television program The Money or the Gun Sullam al-sama', an early 15th-century Persian astronomical treatise whose title can...

ecliptic coordinate system to the equatorial coordinate system. The Sullam al-Sama was authored, which provided the resolution of difficulties met by predecessors...

March 1 – Persian astronomer and mathematician Jamshid al-Kashi completes his treatise Sullam al-sama' ("The Ladder of the Sky") March 7 – At 12 years old...

March 1 – Persian astronomer and mathematician Jamshid al-Kashi completes his treatise Sullam al-sama' ("The Ladder of the Sky") March 7 – At 12 years old...

Abu Ali al-Khayyat (Arabic: أبو علي الخياط; c. 153 – 220 AH (c. 770 – c. 835 CE)), often called by the Latin title Albohali in western sources, (also called...