Compute J2000 ecliptic coordinates (lat, lon, distance)

        If you instead want the coordinates referenced to the dynamical
        system defined by the Earth's true equator and equinox, provide
        an epoch time.

def ecliptic_latlon(self, epoch=None):
        """Compute J2000 ecliptic coordinates (lat, lon, distance)

        If you instead want the coordinates referenced to the dynamical
        system defined by the Earth's true equator and equinox, provide
        an epoch time.

        """
        vector = self.ecliptic_xyz(epoch)
        d, lat, lon = to_polar(vector.au)
        return (Angle(radians=lat, signed=True),
                Angle(radians=lon),
                Distance(au=d))