Snellius Y (Moon)

Satellite Feature of Snellius

Named after Snell, Willebrod van Roijen Snellius - Dutch mathematician, astronomer, optician (1580-1626).

Snellius is a lunar crater located near the southeast limb. The rim is heavily worn and eroded, with overlapping craterlets. The floor is somewhat irregular and uneven. The western rim marks the start of the Vallis Snellius, one of the longest valleys. (wikipedia entry)