Jean Picard (French pronunciation: [ʒɑ̃ pikaʁ]; 21 July 1620 – 12 July 1682) was a French priest, astronomer and pioneer in geodesy, born in La Flèche, where he studied at the Collège royal Henri le Grand. He is best known for accurately measuring the size of the Earth, through a survey of one degree of latitude along the Paris Meridian.
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