+ world::Planet second_planet(9);
+ second_planet.SetParent(sun);
+ second_planet.Mass(1.0e9);
+ second_planet.GetOrbit().SemiMajorAxis(350.0);
+ second_planet.SurfaceTilt(glm::dvec2(PI * 0.125, PI * 0.25));
+ second_planet.AxialTilt(glm::dvec2(PI * 0.95, 0.0));
+ second_planet.AngularMomentum(1.0e8);
+