Portrait of Giuseppe Piazzi (1746-1826),Italian astronomer. Piazzi was a monk,who only took an interest in astronomy from his middle age. In 1801 he discovered the first known asteroid,Ceres,but lost sight of it after only three observations. A period of illness left him unable to observe for a while,but Ceres was rediscovered by Olbers following a remarkable calculation of the orbit by Gauss. In 1814,Piazzi published a catalogue of 7647 stars visible from Sicily,and showed that proper motion was a property of all stars,not just those closest to Earth. The 1000th asteroid found was named Piazzia in his honour | |
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