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0850 – al-Battani – bio

al-Battani (Abu Abdallah Mohammad ibn Jabir Al-Battani) was born around 850 in Turkey (then Mesopotamia) and was a mathematician and astronomer. He advanced the accuracy of astronomical observations beyond that established in Ptolemy’s “Almagest”, including the motion of five planets and the length of our solar year. He catalogued 489 stars. He pioneered the use […]