Entering Longitudes and Latitudes
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Longitudes and latitudes must be entered either in degrees and minutes with a letter indicator of which hemisphere they are in, or as a decimal degree number with its sign indicating which hemisphere (-ve for East or South).
Longitudes and latitude must have at least a degree number (i.e. 0 to 180 for longitude, 0 to 90 for latitude) and a hemisphere code (i.e. E or W for longitude, N or S for latitude). They may also have a minutes number (i.e. 0, 1, 2, 3, ..., 59) and a seconds number. Separators between the numbers may be any of the following: blank( ); slash(/); period(.); colon(:); semi-colon(;) or comma(,).
Some examples of valid longitudes are as follows...
0W 0W0 149e38 78W23 E 167 52 -167.8667
Some examples of valid latitudes are as follows...
0S 0N0 17S58 62n17 S 45 23 -45.3833
Enter ordinary geographic latitudes, even if you want to use the geocentric latitude. (Atlases always give geographic latitudes). If you wish to use geocentric latitudes in chart calculations then you should switch the Geocentric Lats option on. See Optional Correction Factors for instructions on how to do this.