Jean-Baptiste Morin, also known by the Latinized name as Morinus, was a French mathematician, astrologer, and astronomer.

Pierre Gassendi was a French philosopher, Catholic priest, astronomer, and mathematician. While he held a church position in south-east France, he also spent much time in Paris, where he was a leader of a group of free-thinking intellectuals. He was also an active observational scientist, publishing the first data on the transit of Mercury in 1631. The lunar crater Gassendi is named after him.