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The study of planets through mathmatics. This is the theory that the Earth is stationary and at the center of the Universe. All the planets, stars and the Sun revolve around the Earth.
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In this work he proposed what is now called the Ptolemaic system—a unified system in which each heavenly body is attached to its own sphere and the set of spheres nested so that it extends without gaps from Earth to the celestial sphere
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He had a helping hand in trigonometry.
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He came up with the techniques that is requred to create and draw out a map. He came up with longitude and latitude.
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Not much is known about his personal life. But through his work they can guess that he passed away in 170 BCE
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He was born in Egypt in 100 AD
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He died in 160 AD
