The azimuthal orthographic projection (-JG) is one of several
projections with similar syntax and behavior; the one we have
chosen mimics viewing the Earth from space at an infinite distance;
it is neither conformal nor equal-area.
The syntax for this projection is
-JG
where (
) is the center of the map (projection).
As an example we will try
pscoast -R0/360/-90/90 -JG280/30/6i -Bg30/g15 -Dc -A5000 -G255/255/255 \
-S150/50/150 -P >! map.ps