Abdallah Muhammad Ibn Jabir Ibn Sinan al-Battani al-Harrani was born around 858 C.E. in Harran. source
Abdallah Muhammad Ibn Jabir Ibn Sinan al-Battani al-Harrani was born around 858 C.E. in Harran.
Al-Battani was first educated by his father Jabir Ibn San’an al-Battani, who also was a well-known scientist. source
Al-Battani was first educated by his father Jabir Ibn San’an al-Battani, who also was a well-known scientist.
Al-Battani introduced a number of trigonometric relations, and his Kitab az-Zij was frequently quoted by many medieval astronomers, including Copernicus. source
Al-Battani introduced a number of trigonometric relations, and his Kitab az-Zij was frequently quoted by many medieval astronomers, including Copernicus.
One of Al-Battani's best-known achievements in astronomy was the determination of the solar year as being 365 days, 5 hours, 46 minutes and 24 seconds which is only 2 minutes and 22 seconds off. source
One of Al-Battani's best-known achievements in astronomy was the determination of the solar year as being 365 days, 5 hours, 46 minutes and 24 seconds which is only 2 minutes and 22 seconds off.
Al-Battani discovered that the direction of the Sun's apogee, as recorded by Ptolemy, was changing. source
Al-Battani discovered that the direction of the Sun's apogee, as recorded by Ptolemy, was changing.
Al-Battani's work is considered instrumental in the development of science and astronomy. source
Al-Battani's work is considered instrumental in the development of science and astronomy.
Al-Battani's most noted book is the Kitabaz-Zij, a book of astronomical tables, whose original manuscript is stored in the Vatican library. source
Al-Battani's most noted book is the Kitabaz-Zij, a book of astronomical tables, whose original manuscript is stored in the Vatican library.
In the field of mathematics, Al-Battani made important contributions to trigonometry, as he is believed to be one of the first to introduce sines and tangents. source
In the field of mathematics, Al-Battani made important contributions to trigonometry, as he is believed to be one of the first to introduce sines and tangents.
Al-Battani was regarded as one of the most famous Arab astronomers. source
Al-Battani was regarded as one of the most famous Arab astronomers.
Al-Battani calculated the values for the precession of the equinoxes (54.5" per year, or 1° in 66 years) and the obliquity of the ecliptic (23° 35'). source
Al-Battani calculated the values for the precession of the equinoxes (54.5" per year, or 1° in 66 years) and the obliquity of the ecliptic (23° 35').
Al-Battani passed away in 317 H. /929 A.D., near the city of Moussul in Iraq. source
Al-Battani passed away in 317 H. /929 A.D., near the city of Moussul in Iraq.
Al-Battani dedicated all his life until his death to the observation of planets and stars. source
Al-Battani dedicated all his life until his death to the observation of planets and stars.
