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classification

Among the planets of the solar system, I call Mars / Jupiter / Saturn / Uranus / Neptune in the outside a superior planet from an inner-orbit planet, the earth on Mercury / the Venus in the inside from the earth.

A planet sandwiches the earth, and a center, a state in the course same as the sun are called in a state in an opposite direction of the sun. An inner-orbit planet does not have the important duty, and there are two cases of inferior conjunction and the superior conjunction in the other side of the sun that the position of has again just before the sun.

Planets seem to usually move celestial spheres in the east from the west. I call this state direct motion. On the contrary, I call the state that seems to move backward movement from the east to the west. I retrogress in the time of the center so that the earth overtakes the planet in the case of a superior planet when there is it at the position of the center seeing from the earth. I retrogress in the time of the inferior conjunction so that the earth is overtaken in the planet when there is it at the position of the inferior conjunction in the case of the inner-orbit planet. It does not seem to move for a while on a celestial sphere a planet retrogresses from direct motion or when I turn into direct motion from backward movement. This state is called.