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His birth at 100 AD very long before the renaissance.
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It is thought that at about this time he was taught by Theon of Smyrna, or partway through.
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He begins learning about/ observing the stars to expand his knowledge of astronomy.
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He stops observing/ learning.
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the book is very important in astronomy and it has been for 1000 years, and it is his most important works.
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his death at around 170 AD
