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HIPPARQUE (of Nicée); 190-120 av. JC; greek

This greek philosopher compiled the first catalogue of stars (at least the first we keep the trace of) containing about a thousand. He observed between 146 and 127BC from the city of Rhodes and his catalogue mentions the "nebulae" M44 and the Perseus double cluster. He introduced the notion of magnitude to estimate stars' brightness. The catalogue of PTOLEMY is largely inspired by this catalogue.