It is called rotation, and it is an equilibrium motion that can change over time. In nature, the axis of rotation is never exactly perpendicular to the orbital plane, but is often close to it, a result of the planetary formation process.
Rotation.
Retrograde.
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The retrograde motion of a planet is the optical illusionthat a planet reverses its orbital direction, as seen from Earth.In reality, the planet does not change direction at all, but because the Earth is also orbiting the sun, the relative motion of the Earth and another planet in their respective orbits make it appear to us as if the planet reverses course for a while.
When that happens, the planet moves from east to west, from our point of view. This should not be confused with the daily motion of all stars + planets due to Earth's rotation; rather, to the planet's movement against the background of the stars.
Anticlockwise. And if it is in the same direction as its orbit, Prograde spin.
This is nothing as complicated as "models of the universe"... it is a geometric phenomenon. For example, if an outer planet - outside the Earth's orbit - is retrograde, that simply means that Earth is overtaking that planet; temporary the planet seems to go "backwards".The main movement of planets is from West to East; but for part of each orbit, each planet will have an (apparent) movement from East to West - then it is said to be "retrograde".
The most commonly discussed "retrograde" motion is the apparent backward motion of a planet caused by its being lapped by another planet, or vice-versa. Both planets move in a direct (eastward) motion around the Sun, but the planet with the inside (smaller) orbit moves faster than the planet on the outside (larger) orbit, and when it passes the slower-moving planet, each sees the other one as apparently moving backwards relative to its usual motion around the sky. In this "retrograde" motion, neither planet is actually moving backwards; it only appears that way, during the time that one laps the other.
Answer: Retrograde Rotation
They call that retrograde motion
Retrograde rotation
Venus & Uranus rotate in what is called retrograde motion. Retrograde motion is from east to west. All of the other planets including earth rotate from west to east.
A planet is said to be in retrograde motion when its apparent motion - the motion as seen by us, against the background stars - is from east to west.Planets spend more time in prograde motion, from west to east. The apparent movement of Sun and Moon against the background stars is also from west to east. Not to be confused with the daily motion, due to Earth's rotation.
The retrograde motion of a planet is the optical illusionthat a planet reverses its orbital direction, as seen from Earth.In reality, the planet does not change direction at all, but because the Earth is also orbiting the sun, the relative motion of the Earth and another planet in their respective orbits make it appear to us as if the planet reverses course for a while.
If observed from one night to the next, a planet appears to move from West to East against the background stars most of the time. Occasionally, however, the planet's motion will appear to reverse direction, and the planet will, for a short time, move from East to West against the background constellations. This reversal is known as retrograde motion.
Retrograde motion happens when the Earth overtakes an outer planet in its orbit. It happens around the date of Opposition when the planet is opposite the Sun in the sky. Usually planets travel from west to east along the ecliptic, but during retrograde motion they travel backwards, from east to west,.
When that happens, the planet moves from east to west, from our point of view. This should not be confused with the daily motion of all stars + planets due to Earth's rotation; rather, to the planet's movement against the background of the stars.
Actually, 3 planets rotate in a retrograde motion, which, by the way, means that they rotate East to West, or in a counterclockwise motion. Most planets rotate in a clockwise direction, or West to East. The three planets that rotate in a retrograde motion are Venus, Uranus and Pluto.venus
Apparent motion of the planets.
The planet Earth, that we live on, is spinning. It rotates on its axis, once in each 24 hour day. As a result, the sun appears to rise and set.