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Jérôme Lalande

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description Jérôme Lalande Overview

Jérôme Lalande was a prominent French astronomer of the early-modern period. He significantly advanced astronomical knowledge through his meticulous calculations and published ephemerides—tables predicting celestial positions. His work at the Paris Observatory, including the Histoire céleste française, cataloging over 50,000 stars, proved invaluable for navigators, mathematicians, and other scientists reliant on precise astronomical data.

help Jérôme Lalande FAQ

What did Jérôme Lalande calculate from the 1769 transit of Venus?

Lalande used international observations of the transit to refine the estimated distance between Earth and the Sun. That distance is now expressed as the astronomical unit.

Did Lalande record Neptune before it was recognized as a planet?

Lalande's observations included the object later identified as Neptune, decades before its 1846 discovery. Because its apparent movement was not correctly interpreted at the time, it was entered as a star rather than recognized as a planet.

What was Lalande's Astronomie used for?

Astronomie was a major 18th-century textbook covering observational and mathematical astronomy. Lalande also produced ephemerides that helped astronomers predict the positions of celestial objects.

Where did Jérôme Lalande teach astronomy?

He became professor of astronomy at the Collège de France in Paris. His career was also closely connected with the Paris Observatory and the French Academy of Sciences.

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