public double sphericalDistance(LatLong other) {
        return LatLongUtils.sphericalDistance(this, other);
    }
@Test
    public void sphericalDistance_originToIslaGenovesa_returnQuarterOfEarthEquatorCircumference() {
        // This is the origin of the WGS-84 reference system
        LatLong zeroZero = new LatLong(0d, 0d);
        // These coordinates are 1/4 Earth circumference from zero on the equator
        LatLong islaGenovesa = new LatLong(0d, -90d);

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