22static struct state *st = &state;
37 st->M = s * 2.0 *
r *
r * M_PI;
49 return (st->M * sin(
Radians(lat)));
void G_begin_zone_area_on_sphere(double r, double s)
Initialize calculations for sphere.
double G_darea0_on_sphere(double lat)
Calculates integral for area between two latitudes.
double G_area_for_zone_on_sphere(double north, double south)
Calculates area between latitudes.