Orbits of the solar system
Inner orbits of the solar system
In celestial mechanics, an orbit is the trajectory followed by a planet to respond to the gravitational effect of its star. The orbit corresponds to the curvature of space generated by gravitational forces. The four-dimensional fabric of space-time "resembles" the surface of a trampoline, distended by planets and stars. It is this warping, or curvature of spacetime, that creates what feels like gravity.
No orbit is perfectly circular or perfectly coplanar around the Sun's equator. Orbits have a perihelion (closest point to the Sun), an aphelion (farthest point from the Sun) and an inclination (angle relative to the plane of the Sun's equator).
Image: Inner orbits of the solar system.
Outer orbits of the solar system
NB: The Periapsis is the closest point between a celestial object and the focus of the orbit.
Image: Outer orbits of the solar system.