Geometry of the orbital system in the simple case of orbital inclination of i =90°. The star symbol and the open dot denote the positions of the star and the planet, respectively; ω is the angle of periastron, θ is the phase from superior conjunction, and v is the true anomaly; l.o.s. denotes the line of sight. In this configuration, θ equals 0 for transits and π for occultations.