41.Euclides

South-Eastern part of Oceanus Procellarum, at the eastern edge of the map    we see the Riphaeus mountains, in between the mountain massif Riphaeus Zeta, and the crater Lansberg D we find a big Dome. And also numerous rows of hills  and solitary hill. Through a middle size telescope we can see the rille Rima Hergonius I.

EUCLIDES - Eucildes (Εὐκλείδης) (Born about 300 BC). Greek mathematician, worked in Alexandria, Egypt. Author of a work on geometry, "The Elements", in 13 parts. Organizer of school of mathematics in Alexandrie.

Crater. (12Km /7Mi Ø ) (Dept: 1,000m /3,000ft) (7.4° S, 29.5° W) Strongly pronounced, bright coloured crater. Circular formation, bowl shape and with bright ejecta situated to the west of Montes Riphaeus. Steep slopes supporting a small mountain to the east, high walls, rounded floor.

HERIGONIUS - Pierre Hérigone. (Died in 1644) French Mathematician, author of the 6 part "Cursus Mathematicus" also containing "Spherical Astronomy" and a theory about the movement of the planets.

Crater. (15Km /9Mi Ø ) (Dept: 2,100m /6,400ft) (13.3° S, 33.9° W) Isolated circular formation overlapping Dorsa Ewing to the East
and supporting a craterlet to the north, steep slopes, high walls, flat floor.

OCEANUS PROCELLARUM - Ocean of Storms. Named by Riccioli (1651). Riccioli's Moon Map.

Ocean. (721x488Km / 448x303Mi) (Centre: about 0.0° N, 50.0° W) Procellarum is the largest of the maria, stretching more than 2,500 km (1,600 mi) across its north-south axis and covering roughly 4,000,000 km² (1,500,000  mi² ). Larger lunar sea. 2,102,000 km². Very flat to the center. 80 m altitude difference in a 400 km diameter circle.  Numerous ridges rilles, leftovers of walls. Ghost craters and lava flooded craters, many small hills. The landscape of the area depicted on chart 41 is basically the same. Rays from Crater Copernicus and other ray craters.  The robotic lunar probes Luna 9, Luna 13, Surveyor 1 and Surveyor 3 landed in Oceanus Procellarum. The manned Apollo 12 mission also landed in Oceanus Procellarum, with astronauts Pete Conrad and Alan Bean on board. Their landing site, within 300m of Surveyor 3, has become known as Mare Cognitum. North of Euclides F (5.2 km ø ) (height: 1090m), and in surroundings of Herigonius are ridges which should be counted amongst the most articulated systems on the Moon.

RIPHEUS MONTES - Riphae Mountains. Greek Mythological mountains. (Compare map 42) The mountains were according to Greek tradition the birthplace of the North-Wind. Riphae Zeta is called "Ural" on older Moon charts.

Mountains. (155 x 38,5Km / 91 x 24Mi ) (7.7° S, 28.1° W) North - South oriented mountain chain. Formed of isolated mountains and parallel linkages. North part sometimes called Montes Ural. Flat region contained in mountains to the north in communication with Mare Cognitum.

WICHMANN -  Moritz L. G. Wichmann. (1821 - 1859) German astronomer. Determined, and discovered the inclination of the lunar equator, and proved as first the physical libration of the Moon.

Crater. (10Km / 6Mi Ø ) (Dept: 1,000m /3,000ft) (7.5° S, 38.1° W) Isolated circular formation with a bowl shape, situated to the south of a chain of hills in form of a stone lance. Few steep slopes supporting a north-south oriented mountainous chain to the north. Few high walls. Rounded floor.
 

          41.