Definition of planet: “A planet is a celestial body that is in orbit around the Sun, which has sufficient mass for its gravity to overcome the cohesive forces of the solid body and maintain it in hydrostatic equilibrium (spherical shape) , and which eliminated any body moving in a close orbit. This definition was approved on August 24, 2006, during the 26th General Assembly of the IAU by a show of hands of 400 scientists after ten days of discussions.
If we could look at the Solar System from the outside, far above the Earth's north pole, we would see the planets rotating around the Sun, counterclockwise. We would see that the rotation disk of the planets is remarkably flat, only Mercury has an orbit inclined relative to the others (7°). But we wouldn't notice the planets rotating on their axis. Each planet revolves around a different axis of rotation.
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Perihelion and Aphelion: The Apsides in the Solar System 
Winds of the solar system and giant planets
3D Simulator: Revolutions of the Planets
Planet Mercury
Venus, the Shepherd's Star
Earth, the Blue Planet: A Fragile Jewel in the Universe
Mars: The Conquests and First Human Steps on the Red Planet
Planet Jupiter
Saturn: The Ringed Giant of Ice and Rock
Planet Uranus
Neptune: The Blue Giant of the Solar System
Roche limit
Remarkable characteristics of the planet Venus
Remarkable characteristics of the planet Jupiter
Remarkable characteristics of the planet Saturn
Characteristics of Planets: What Makes Them Unique
Venus, Veiled Planet: A Puzzle in our Solar System
Live on Mars
The seven wonders of the World
Planet 9 is still nowhere in sight
Axial Tilt of Planets: An Unstable Dance Through the Ages
Comparative sizes of planets and stars
The Journey of the Planets Along the Ecliptic: A Cosmic Choreography
Equation for the orbital speed of a planet
Declination and right ascension
Saturn's Rings: A Ring System in Jeopardy
Dwarf Planets: The Forgotten Worlds of the Solar System 
Physical Composition of Trans-Neptunian Objects in the Kuiper Belt
Haumea and its Moons: A Singularity of the Solar System
The Enigma of the Oort Cloud: Indirect Evidence and Uncertainties
Sedna: Between the Kuiper Belt and the Oort Cloud
Quaoar: The Dwarf Planet Defying the Roche Limit with its Rings
The 40 largest objects in the solar system
Pluto's Satellites: Strange Companions in the Dwarf Planet's Shadow
Ceres: Boundary Between Asteroid and Dwarf Planet
Pluto and its Moons: Charon, Nix, Hydra, Styx, and Kerberos
Eris: The Dwarf Planet at the Edge of the Solar System