parallel of latitude A circle, or approximation of a circle, on the surface of the Earth, parallel tot he Equator, and connecting points of equal latitude; a circle of the celestial sphere parallel to the ecliptic, ...
The PLEN column is the length of the parallel of latitude, and the PDFE column is multiplied by 0.5072 to obtain the distance of that parallel from the equator. Meridians of longitude are equally spaced on each parallel of latitude.
The equator is a great circle, but no other parallel of latitude is a great circle.
Any two great circles will intersect each other at a pair of antipodal points.
of the ellipsoid; f = flattening of the ellipsoid; ho = scale factor at central meridian; h = relative scale factor along a meridian of longitude; ko = scale factor at standard parallel(s); k = relative scale factor along a parallel of latitude; ...
 See also: Parallel, Map, Latitude, Class, Projection
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