#define incl2lat(incl) (90-(incl)*180/G_PI)
#define lat2incl(lat) ((90-(lat))*G_PI/180)
#define rad2elev(rad) ((rad)-EARTH_R)
#define incl2lat(incl) (90-(incl)*180/G_PI)
#define lat2incl(lat) ((90-(lat))*G_PI/180)
#define rad2elev(rad) ((rad)-EARTH_R)