Which planet takes almost 30 Earth years to orbit the sun?
Circumbinary planet spacecraft, announced the first partial-eclipse-based discovery of a circumbinary planet. The planet, called Kepler-16b, is about 200 light years from Earth, in the constellation Cygnus, and is believed to be a frozen world of rock and gas, about the mass of Saturn. It orbits two stars that are also circling each other, one about two-thirds the size of our sun, the other about a fifth the size of our sun. Each orbit of the stars by the planet takes 229 days, while the planet orbits the system's center of mass every 225 days; the stars eclipse each other every three
Sun-synchronous orbit per orbit for an orbit around an oblate planet is (equation 24 of the article Orbital perturbation analysis (spacecraft)) given by where An orbit will be Sun-synchronous when the precession rate equals the mean motion of the Earth about the Sun, which is 360° per sidereal year (), so we must set , where is the orbital period. As the orbital period of a spacecraft is (where is the semi-major axis of the orbit), and as for a circular or almost circular orbit, it follows that or when is 360° per year, As an example, for = (the spacecraft about