The area in-between Lansberg and Fra Mauro is part of the Sea of storms. The lower halve of the chart is filled with Mare Cognitum. The at first sight unremarkable area contains several topographically and selenographically interesting areas. No wonder it became the target of several spaceflights. We find the landing places of Ranger 7, Luna 5, Surveyor 3, and two manned expeditions in this area. Apollo 12, landed near Surveyor 3, and Apollo 14 landed in the hills north of Fra Maro.
MARE COGNITUM - Sea that we Know. (Named in 1964) After the successful flight of Ranger 7, the space probe that sent the first close up picture of the Moon surface, showing details a 100 times smaller than any detail seen from Earth, the part where the space probe hit the Moon was renamed.
Mare. (376 km /234 Mi ø ) ( 10.0°S, 23.1°W) Lava flooded basin, or crater. The Montes Riphaeus form part of its rim.
Crater. (94 km /56 Mi ø ) (6° S, 17° W) Damaged circular formation forming an interesting trio with Bonpland and Parry. Steep slopes supporting Bonpland to the south Parry to the South-East. High walls deformed to the south, eroded to the east and supporting Fra Mauro D & X to the north. Very large flat floor more tormented to the west, Crossed by Rimae Parry. Craterlets whose Fra Mauro N and P to the north Fra Mauro E to the center and Fra Mauro F to the south.
LANSBERG - Philips van Lansberg (1561-1632) Theologian and astronomer, settled in Middelburg, Zealand in 1613, and concentrated on astronomy. Wrote manuals for the use of the astrolabium and the gnomon, instruments important for navigation using the stars. First Clergyman to support the theories of Copernicus.
Crater. (40 km /24 Mi ø ) (Dept: 3,110m /9,400ft) (0.3°S, 26,6°W) Isolated circular formation with steep slopes, high walls with terraces, extensive and flat floor. Central mountain double. Craterlets.
Ocean. (721 x 488 km / 448 x 303 Mi) (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 2,102,000 km2. Larger lunar sea. 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 ) (Dept: 1,090 m), and in surroundings of Herigonius are ridges which should be counted amongst the most articulated systems on the Moon. On Chart 29 for example we find the rays of the crater Kepler.
Mountains (189 km / 117 Mi ø ) (30-50 km wide) (7.7° S, 28.1° W) Irregular range along the west-northwestern edge of Mare Cognitum, on the southeastern edge of Oceanus Procellarum. It includes a number of slender ridge lines with valleys flooded by flows of lava.