Oriental Scholars – S1E25 – Al Battani
Al Battani was from Battan, the capital of Harran. He was a famous astrologist, astronomer, and mathematician. He was first educated by his father, Jabir Ibn Sin’an al-Battani, who was also a well-known scientist. He calculated the solar year as 365 days, 5 hours, 46 minutes and 24 seconds. He proved the possibility of annular eclipses of the sun and determined with greater accuracy the obliquity of the seasons and the true and mean orbit of the ecliptic, the length of the tropical year and the seasons and the true and mean orbit of the sun and revised orbits of the Moon and planets. He provided very ingenuous solutions for some problems of spherical trigonometry using the methods of orthographic projection. He also authored “Al-Zij” which comprised of 57 chapters.