public double sphericalDistance(LatLong other) {
        return LatLongUtils.sphericalDistance(this, other);
    }
@Test
    public void sphericalDistance_originToNorthPole_returnQuarterOfEarthEquatorCircumference() {
        // This is the origin of the WGS-84 reference system
        LatLong zeroZero = new LatLong(0d, 0d);
        // Calculating the distance between the north pole and the equator
        LatLong northPole = new LatLong(90d, 0d);

        double spherical = LatLongUtils.sphericalDistance(zeroZero, northPole);
        assertEquals(EARTH_EQUATOR_CIRCUMFERENCE / 4, spherical, 0d);
    }