public double degNS() {
        checkGeoCircle();
        return 0.000001 * y;
    }
Obtain degrees latitude (North-South direction); negative numbers are degrees South.
Expected range is [-90.0,+90.0] only.
May only be called when isGeoCircle() returns true.
container-search/src/main/java/com/yahoo/prelude/Location.java