In celestial mechanics, an orbit is the trajectory of a planet in response to the gravitational effect of its star. The orbit corresponds to the curvature of the space caused by gravitational forces. The four-dimensional fabric of space-time, like the surface of a trampoline, distended by the planets and stars. It is this distortion or curvature of space-time, which creates what it feels like gravity. In the solar system, all the planets, asteroids and comets are in orbit around the Sun. Similarly, around the planets natural or artificial satellites follow the curvature of space and follow an orbit around their planet. Nothing is perfectly circular orbit around the Sun's equator, they have a perihelion (closest point of the Sun), an aphelion (farthest point from the Sun) and inclination (angle to the equator).
Nota: The Apoapside is the farthest point from a celestial object and the focus of the orbit. The Apogee is the farthest point between a satellite and the Earth. The Aphelion is the point farthest from a celestial object and the Sun.
External orbits of the solar system
Objects
Average distance from the Sun
Mercury
57 900 000 km
Venus
108 200 000 km
Earth
149 600 000 km
Mars
227 900 000 km
Jupiter
778 410 000 km
Saturn
1 427 000 000 km
Uranus
2 870 000 000 km
Neptune
4 496 000 000 km
Nota: The Periapsis is the closest point between a celestial object and the focus of the orbit. The Perigee is the closest point between a satellite and the Earth. The Perihelion is the nearest point between a celestial object and the Sun.