Forward evolution of the obliquity from the ZAMS for different initial values of the angle itself. The planetary orbit is assumed circular and the initial orbital period is 0.7 days, while the initial rotation period of the star is 0.48 days for ϵ(t = 0) = 45°, 0.60 days for ϵ(t = 0) = 30°, and 0.67 days for ϵ(t = 0) = 15°, to prevent the infall of the planet.