An Auxiliary Latitude given by
See also Latitude
References
Adams, O. S. ``Latitude Developments Connected with Geodesy and Cartography with Tables, Including a Table for
Lambert Equal-Area Meridional Projections.'' Spec. Pub. No. 67. U. S. Coast and Geodetic Survey, 1921.
Snyder, J. P. Map Projections--A Working Manual. U. S. Geological Survey Professional Paper 1395. Washington,
DC: U. S. Government Printing Office, pp. 17-18, 1987.