Hipparchus in his observatory in Alexandria. In the center is an armillary sphere (spherical framework of rings, centered on Earth, that represent lines of celestial longitude and latitude and other astronomically important features such as the ecliptic). Hipparchus (190-120 BC), was a Greek astronomer, geographer, and mathematician of the Hellenistic period. A methodical observer, Hipparchus compiled the first known star catalogue, listing some 850 stars, as well as their celestial coordinates and magnitude. His work profoundly influenced that of Ptolemy. He is considered the founder of trigonometry. Hipparchus is considered the greatest ancient astronomical observer. He was the first whose quantitative and accurate models for the motion...
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