Surveying the earth


Surveying the earth

The book of science

Tom Sharp

Jean Picard geodesy

Surveying the earth



Jean Picard corresponded with Huygens, Newton, Ole Rømer who made the Rømer temperature scale, Rasmus Bartholin who discovered birefringence, and Giovanni Cassini, who calculated the distance between Earth and Mars. Picard used Christiaan Huygens’ pendulum clock in measuring the right ascension of celestial objects in 1673, and his measurement of the earth was useful to Isaac Newton in his theory of universal gravitation.

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