Lat: 29.3°S, Long: 55.7°E, Diam: 82 km, Depth: 3.83 km, Rükl: 59
LO-IV-053H Snellius A is the 37-km crater in the upper left, To its immediate right is 7-km Snellius X. 29-km Snellius B is partially visible along the lower left margin.
(IAU Directions) SNELLIUS.--A very fine ring-plain, 50 miles in diameter, S.W. of Petavius, with terraced walls, considerably broken on the S.W. by craters, &c. It rises on the W. nearly 7,000 feet above a dark floor, which contains a central mountain. N.W. of Snellius is a smaller ring- plain (Snellius a), and due W. a curious rough plateau, bordered on the N. and S. by a number of small craters.
- Depth data from Kurt Fisher database
Westfall, 2000: 3.83 km
Cherrington, 1969: 3.56 km
- Snellius and its satellite crater B are on the ALPO list of bright ray craters
- Willebrord van Roijen Snell (Snellius) (1580 - October 30, 1626) was a Dutch astronomer, optician and mathematician most famous for the law of refraction now known as Snell's law.
- According to Whitaker (pp. 215), this name was introduced on Riccioli's map, however Riccioli used this name to label the feature now known as Stevinus. At the same time, Riccioli used the name Stevinus to label the present feature. Whitaker does not explain precisely when the names were swapped to their current assignments. - Jim Mosher
- Catena Snellius A (an unofficial name from D.Caes for the chain of depressions southwest of Snellius A). http://bit.ly/2DssKxl
A Portfolio of Lunar Drawings (Harold Hill), pages 232, 233.