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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.
Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; ... Selenographic coordinate system; List of maria on the Moon;
The Pre-Nectarian period is defined from the point at which the lunar crust formed, to the time of the Nectaris impact event. Nectaris is a multi-ring impact basin that formed on the near side of the Moon, and its ejecta blanket serves as a useful stratigraphic marker. 30 impact basins from this period are recognized, the oldest of which is the South Pole–Aitken basin.
The subsolar point moves constantly on the surface of the Earth, but for any given time, its coordinates, or latitude and longitude, can be calculated as follows: [3] ϕ s = δ , {\displaystyle \phi _{s}=\delta ,} λ s = − 15 ( T G M T − 12 + E m i n / 60 ) . {\displaystyle \lambda _{s}=-15(T_{\mathrm {GMT} }-12+E_{\mathrm {min} }/60).}
Copernicus is a lunar impact crater located in eastern Oceanus Procellarum.It was named after the astronomer Nicolaus Copernicus. [1] It typifies craters that formed during the Copernican period in that it has a prominent ray system.
Geodetic latitude and geocentric latitude have different definitions. Geodetic latitude is defined as the angle between the equatorial plane and the surface normal at a point on the ellipsoid, whereas geocentric latitude is defined as the angle between the equatorial plane and a radial line connecting the centre of the ellipsoid to a point on the surface (see figure).