Mason is the remains of a lunar crater that lies in the northeastern part of the Moon. It is nearly attached to the eastern rim of the flooded Plana crater, and southeast of Bürg crater. Along the northern rim of Mason is the southern edge of the Lacus Mortis, a small lunar mare. To the south is the larger Lacus Somniorum. Latitude, denoted by the Greek letter φ, gives the location of a place on Earth north or south of the Equator. ... Map of Earth showing curved lines of longitude Longitude, sometimes denoted by the Greek letter λ, describes the location of a place on Earth east or west of a north-south line called the Prime Meridian. ... For the geometric term, see diameter. ... Look up depth in Wiktionary, the free dictionary In classical physics, depth is a distance measured vertically from top to bottom (height) or horizontally from outside to inside (thickness). ... Selenographic coordinates are coordinates that refer to locations on the surface of the Moon. ... An eponym is a person, whether real or fictitious, whose name has (or is thought to have) given rise to the name of a particular place, tribe, discovery, or other item. ... Charles Mason (1730–1787) was an English astronomer. ... This is a list of the craters on the Moon. ... This is a list of the craters on the Moon. ... Lunar may refer to: an adjective that means having to do with or pertaining to the Moon, or to moons in general. ... This article is about impact craters, also known as meteor craters. ... Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ... Lacus Mortis, latin for Lake of Death, is a plain of basaltic-lava flows in the northeastern part of the Moon. ... The Lunar maria (singular: mare, pronounced MAH-ray) are large, dark, basaltic plains on Earths Moon, formed by ancient basaltic flood eruptions caused by extremely large meteoroid impacts. ... Lacus Somniorum is a small plain located in the northeastern part of the Moons near side. ...

This is a heavily eroded crater formation that is somewhat irregular in shape, being longed along the east-west direction. The rim is an uneven, disintegrated ring of ridges that have merged with the rough terrain to the south and east. There are clefts or valleys in the western rim that reach the eastern rim of Plana crater. The interior floor has been resurfaced by lava, and forms a nearly level basin within the rim. The small crater 'Mason A' lies in the northwest part of the floor. Look up Lava, ‘A‘a, or Pāhoehoe in Wiktionary, the free dictionary Lava is molten rock that a volcano expels during an eruption. ...

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Mason crater.