#cysalus

From top left to bottom right:

Clavius crater is named after Christopher Clavius (1538-1612), a Jesuit German mathematician and astronomer. He was one of the members of the commission that approved the Gregorian calendar.

Rutherfurd crater is named after Lewis Rutherfurd (1816-1892), an American lawyer and astronomer, and pioneering astrophotographer. He produced high quality photographs of the Sun, Moon, and the planets, as well as stars and star clusters. Notably, he was one of the founding members of the National Academy of Sciences in 1863.

Cysalus crater is named for Johann Baptist Cysat (c. 1587-1657), a Swiss Jesuit mathematician and astronomer. His most important work was on comets, particularly the comet of 1618, demonstrating that it orbited around the Sun in a parabolic orbit.