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Ancient Greek Ptolemaic System and Modern Observatories

Explore the ancient Greek Ptolemaic system, a geometrical model of the universe used to discover the precession of the equinoxes. Discover advancements by Guo Shoujing, Al-Battani, Tycho Brahe, and modern observatories.

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Ancient Greek Ptolemaic System and Modern Observatories

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  1. Ptolemaic system developed in ancient Greece: Geometrical model of universe – used to discover the “precession of the equinoxes” precession of the equinoxes

  2. Gnomon at Dengfeng; ca.1250 ADGuo Shoujing measures length of year to accuracy of about half a minute in 1280 AD

  3. Observatory at Samarkand, ca. 1450Al Battani measures tilt of ecliptic to within one hundredth of a degree: ca. 900 A.D.

  4. ca. 1600: Tycho Brahe and his observatory

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