public double degEW() {
        checkGeoCircle();
        return 0.000001 * x;
    }
Obtain degrees longitude (East-West direction); negative numbers are degrees West.
Expected range is [-180.0,+180.0] only.
May only be called when isGeoCircle() returns true.
container-search/src/main/java/com/yahoo/prelude/Location.java