Pehr Wargentin

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Pehr Wargentin
Pehr Wilhelm Wargentin (1717-1783), Swedish astronomer, statistician and demographer. He studied astronomy at Uppsala University. He became a research assistant to the Professor of Astronomy at Uppsala, Anders Celsius, geophysicist and geodesist, known for the centigrade thermometer scale. Celsius founded an astronomical observatory which played a special role in the early work of terrestrial longitude determinations. In this research Pehr Wargentin measured differences in local time between two geographical locations on Earth by systematically studying the eclipses and meridian transits of the moons of the planet Jupiter. Using an intuitive statistical method he computed a set of accurate predictive tables which were accepted as an international standard. Wargentin spent most of the rest of his life studying the irregularities of the moons of Jupiter and updating his tables.
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