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The value of the selenographic colongitude increases from 0° to 359° in the direction of the advancing terminator. Sunrise occurs at the prime meridian when the Lunar phase reaches First Quarter, after one fourth of a lunar day. At this location the selenographic colongitude at sunrise is defined as 0°.
"Lunar Day," from the book Recreations in Astronomy by H. D. Warren D. D., 1879. Later study showed that the surface features are much more rounded due to a long history of impacts.
The Fifth Fundamental Catalogue (FK5) was a 1988 update of FK4 with new positions for the 1,535 stars. It was superseded by the quasar -based International Celestial Reference Frame (ICRF). The Fifth Fundamental Catalogue Extension (FK5), published in 1991, added 3,117 new stars.
Lunar north polar region mosaic by LRO.The north pole is in the center. The lunar north pole is the point in the Northern Hemisphere of the Moon where the lunar axis of rotation meets its surface.
A planetary coordinate system (also referred to as planetographic, planetodetic, or planetocentric) [1] [2] is a generalization of the geographic, geodetic, and the geocentric coordinate systems for planets other than Earth. Similar coordinate systems are defined for other solid celestial bodies, such as in the selenographic coordinates for the ...
Title page. Selenographia, sive Lunae descriptio (Selenography, or A Description of The Moon) was printed in 1647 and is a milestone work by Johannes Hevelius.It includes the first detailed map of the Moon, created from Hevelius's personal observations. [1]
NASA Catalogue of Lunar Nomenclature (PDF). NASA RP-1097. Archived from the original on 2014-10-06. {}: CS1 maint: bot: original URL status unknown , no ISBN. Ben Bussey and Paul Spudis, The Clementine Atlas of the Moon, Cambridge University Press, 2004, ISBN 0-521-81528-2.
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.