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Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune are the eight planets in the Solar System, listed in order of increasing distance from the Sun. Known as primary or main planets, they all have enough mass to assume an approximately spherical shape. The planets orbit the Sun in the same direction, in a translational movement. This movement, seen from the Earth's North Pole, follows a counterclockwise direction, called direct direction. During the translation movement, each planet describes an imaginary line around the Sun, called an orbit. The orbits of the planets are:
• Elliptical – that is, they are shaped like ellipses, being practically circular;
• Independent – one from the other;
• Coplanar – as they are all practically on the same plane.
