A null geodesic of order n = 2 (two θ turning points), in blue. The black disk is the event horizon and the yellow lines indicate the angular turning points θ₋ and θ₊ = π − θ₋, which are computed from the analytical expression for θ₋ as a function of black hole spin and the geodesic constants of motion (see, e.g.,Gralla & Lupsasca 2020a). The three equatorial crossings of the geodesic are labeled by the black dots.