Al-Battani
c. 858 CE–c. 929 CE · Harran
Al-Battani (in full Abu Abd Allah Muhammad ibn Jabir al-Battani; Latinized in medieval Europe as Albategnius) was one of the most accomplished astronomers of the medieval Islamic world. He was born around 858 CE in Harran, an ancient city in the Jazira region (in what is now southeastern Turkey), and died in 929 CE at Qasr al-Jiss, near Samarra in Iraq.
His family bore the epithet "al-Sabi," marking descent from the Sabians of Harran, a community known for star-lore and astral religion; his father, Jabir ibn Sinan, is reported to have been a maker of astronomical instruments. Al-Battani himself was a Muslim, as his given name Muhammad indicates, and there is no reliable evidence that he practiced the Sabian religion.
He carried out decades of careful observations, chiefly at Raqqa on the Euphrates, and is reported to have observed a solar and a lunar eclipse at Antioch in 901. His major work, the "Kitab al-Zij al-Sabi" (a zij is a handbook of astronomical tables), refined existing values for the length of the solar year and the motions of the Sun, Moon, and planets, and advanced trigonometric methods.
Centuries later the Zij was translated into Latin and read across Europe; al-Battani is cited repeatedly by Copernicus. According to the bibliographer Ibn al-Nadim, financial and tax troubles late in life drew him from Raqqa toward Baghdad, and he died on the return journey.
Did you know?
An astronomer's numbers Copernicus was still using six centuries later
The astronomer al-Battani, observing from Raqqa around the year 900, measured the length of the solar year and the tilt of the ecliptic with striking precision. When Copernicus published De Revolutionibus in 1543, he cited al-Battani by name more than twenty times, still drawing on observations made over six centuries earlier.
How we know
al-Battani c. 858–929 CE (observations at Raqqa from 877); Copernicus's De Revolutionibus published 1543; al-Battani named ~23 times in it (Britannica; Wikipedia; De Revolutionibus text). 1543 − 929 = 614 years.
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Harran
What they did here
Al-Battani was born around 858 CE in Harran, in the Jazira. His family bore the epithet 'al-Sabi,' indicating descent from the Sabian community of Harran; his father Jabir ibn Sinan is reported to have made astronomical instruments. The exact birth year is a traditional estimate (sources give 'about 850,' 'before 858,' and 'c. 858').
About Harran
Harran (classical Carrhae), in southeastern Turkey near the Syrian border, was famous in the early Islamic period as a centre of the Sabian community and of Greek-into-Arabic science. The mathematician-astronomers Thabit ibn Qurra (d. 901) and al-Battani (d. 929) came from Harran and its region; the Hanbali theologian Ibn Taymiyya (d. 1328) was also born there before his family fled the Mongols to Damascus.
The world in their lifetime
Thinkers and teachers of other traditions whose lives overlapped with Al-Battani’s — a glimpse of the wider world they lived in. Drawn purely from recorded birth and death years.
Buddhist world
Works
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