Hipparchus, Ancient Greek astronomer, 2nd century BC (c1880). Artist's reconstruction of Hipparchus (c190-c127 BC) at work. 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. Hipparchus was also an early pioneer of ttrigonometry.
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