Hipparchus (Greek ; ca. 190 BC - ca. 120 BC) was a Greek astronomer, geographer, and mathematician of the Hellenistic period. Hipparchus was born in Nicaea (now Iznik, Turkey), and probably died on the island of Rhodes. He is known to have been a working astronomer at least from 147 BC to 127 BC. Hipparchus is considered the greatest astronomical observer and, by some, the greatest overall astronomer of antiquity. Wikipedia
The definitive Wikipedia entry for Hipparchus. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Hipparchus
The definitive Wikipedia entry for Hipparchus. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Hipparchus_(astronomer)
The definitive Wikipedia entry for Hipparchus. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Hipparchus_%28astronomer%29