Typical light curve in the time domain for a planet binary, as observed edge on. The system has zero inclination and the planet radii have ratio s₁ ∕s₂ = 2. The bottom horizontal axis shows two annual periods, the top horizontal axis shows the lunar periods. Orange: signal from the planet, light blue: signal from the moon, blue: nett signal. The frequencies have ratio Ω∕ω = 254∕19, as for Earth’s approximate Metonic cycle, so that the overall periodicity is actually 19 orbits.