Asolar system is composed of a star and a planet that goes around the star in a circunference. the planet spins around itself with the axis of this rotation perpendicular to the plane of its orbit around the star. i need to find the position of the star with respect to a reference frame attached to the surface of the planet, asumming that: 1) the distance between the planet and the star is far greater than the radius of the planet; 2) the radius of the planet is significant.