ptolemaic system developed in ancient greece:
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Ptolemaic system developed in ancient Greece: Geometrical model of universe – used to discover the “precession of the equinoxes”. precession of the equinoxes. Gnomon at Dengfeng; ca.1250 AD Guo Shoujing measures length of year to accuracy of about half a minute in 1280 AD. - PowerPoint PPT PresentationTRANSCRIPT
Ptolemaic system developed in ancient Greece:
Geometrical model of universe – used to discover the “precession of the equinoxes”
precession of the equinoxes
Gnomon at Dengfeng; ca.1250 ADGuo Shoujing measures length of year to accuracy of about
half a minute in 1280 AD
Observatory at Samarkand,
ca. 1450
Al Battani measures tilt of ecliptic to within one
hundredth of a degree: ca.
900 A.D.
• ca. 1600: Tycho Brahe and his observatory