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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.
The book covers topics such as time, coordinate systems, the Sun, planetary systems, binary stars, the Moon and eclipses. [1] The third edition features new sections on generalised coordinate transformations, nutation, aberration, and selenographic coordinates. The fourth edition, coauthored by Jonathan Zwart, adds "or Spreadsheet" to the end ...
In 1750, Johann Meyer produced the first reliable set of lunar coordinates that permitted astronomers to locate lunar features. [ citation needed ] Lunar mapping became systematic in 1779 when Johann Schröter began meticulous observation and measurement of lunar topography .
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 latitudes and longitudes are in selenographic coordinates. Albedo ... (PDF). NASA RP-1097. Archived from the original on 2014-10-06. ...
The western rim projects into the near side of the Moon, as defined by the selenographic coordinate system. However the visibility of this formation depends on the effects of libration, so that it can be brought fully into view or completely hidden depending on the orientation of the Moon. When visible, however, it is seen nearly from the side ...
The selenographic coordinates of this feature are 11.7° N, 17.9° E. It has a diameter of 112 km. [1] Sinus Honoris has a wide mouth and is bordered by uneven terrain to the north and southwest. Where the bay joins the mare, rille systems extend to the north and south.
The selenographic coordinates of this range are 38.4° N, 10.0° E, and it has an official diameter of 445 km. [1] However some observers list the length as being up to 550 km. The tallest peaks in this range reach heights of 6 km, undoubtedly providing an expansive view of the surroundings from their tops.