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For precise applications, many coordinate systems have been defined for the Moon, each with a slightly different prime meridian. The IAU recommends the "mean Earth/polar axis" system, [1] in which the prime meridian is the average direction (from the Moon's center) of the Earth's center. [2]
The word selenography is derived from the Greek word Σελήνη (Selene, meaning Moon) ... Selenographic coordinate system; List of maria on the Moon;
The latitudes and longitudes are in selenographic coordinates. Albedo. These features have a high albedo compared to the surrounding terrain. Name Coordinates
West and east on the Moon are where they would be expected, when standing on the Moon. But when the Moon is seen from Earth, then the east–west direction is reversed. When specifying coordinates on the Moon it should therefore always be mentioned whether geographic (or rather selenographic) coordinates are used or astronomical coordinates.
The center of the range is located at selenographic coordinates 17.5° S, 81.6° W, and the diameter spans 574 km (357 mi). This range lies across the Moon’s southwestern limb, meaning it is observed from the side when viewed from Earth. The western extreme extends to approximately 116° W, placing it on the far side of the Moon.
It is located at selenographic coordinates 37.56° N, 30.8° E, and has a diameter of 424.76 kilometers. [1] The name is Latin for Lake of Dreams, a title given to this feature by Giovanni Riccioli. [2] It is the largest of the lunar features designated Lacus. Lacus Somniorum is an irregular feature with complex, somewhat ill-defined borders.
Valley Coordinates Dimension Eponym Crater; Vallis Alpes: 166 km Latin name meaning "Alpine valley" : None Vallis Baade: 203 km Walter Baade: Baade: Vallis Bohr: 80 km Niels Bohr: Bohr ...
Like most of the other maria on the Moon, Mare Serenitatis was named by Giovanni Riccioli, whose 1651 nomenclature system has become standardized. [6] Previously, William Gilbert had cited it as within the Regio Magna Occidentalis ("Large Western Region") in his map of c.1600. [7]