Jérôme Lalande
![''Jérôme de La Lande'' by [[Jean-Honoré Fragonard]], c. 1769](https://upload.wikimedia.org/wikipedia/commons/f/f7/J%C3%A9r%C3%B4me_de_La_Lande.jpg)
Joseph Jérôme Lefrançois de Lalande (; 11 July 1732 – 4April 1807) was a French astronomer, freemason and writer. He is known for having estimated a precise value of the astronomical unit (the distance from the Earth to the Sun) using measurements of the transit of Venus in 1769.
Provided by Wikipedia
1
2