Smoothing the Basis for the Investigation of the Meaning of Transits


Abu al-Rayhan al-Biruni (also known by the Latinized version of his name, Alberonius, 973–1048 AD; 362–440 AH) was an 11th-century Muslim polymath whose works and scholarly interests spanned the physical and natural sciences, mathematics, astronomy, geography, history, chronology, and linguistics. Al-Biruni was born in Kath, Khuwarazm, in present-day Uzbekistan, and died in Ghazni, in what is today east-central Afghanistan. He wrote more than 120 works and is considered the founder of Indology for his detailed description of 11th-century India. The crater Al-Biruni on the moon is named after him. Tamhīd al-mustaqarr li-taḥqīq maʻná al-mamarr (Smoothing the basis for the investigation of the meaning of transits) is a treatise dealing with the subject of light rays and shadow lengths. It was al-Biruni who discovered that light traveled more quickly than sound.

Last updated: April 3, 2018