Geological Chronicle
Located on Mare Insularum just south of the lunar equator, Lansberg measures 38.75 kilometers in diameter. Formed during the Late Imbrian epoch, the crater is not noticeably eroded and contains no significant impact craters within its interior.
The crater has a central mountain and a high rim that rises gradually from the exterior. Terraces line the inner walls, where the upper slopes have slumped to produce a sharp edge, matching 19th-century observer Thomas William Webb's note that the rim rises very gradually without, but is steep and terraced within.
The International Astronomical Union formally adopted the name Lansberg in 1935 in honor of Belgian astronomer Philippe van Lansberge, though the spelling Landsberg has also appeared historically. Approximately 40 kilometers to the southeast lies the landing site of the Luna 5 probe, with the touchdown sites of Surveyor 3 and Apollo 12 situated a further 60 kilometers in the same direction.