what does retrograde mean
Retrograde motion of planets refers to the apparent backward or east-to-west motion that planets occasionally exhibit as seen from Earth. In our solar system, most planets, including Earth, orbit the Sun in the same direction (counterclockwise when viewed from above the Sun's north pole). However, due to differences in orbital speed and distance from the Sun, there are times when it appears as though a planet is moving backward in the sky relative to the fixed stars. This phenomenon is called retrograde motion.
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It is the apparent backward movement of a body, overtaking a car that you are passing on the highway, it appears that the other car is moving backwards (relative to you).
In Astronomy this is most noticeable in the apparent motion of the planet Mars through the sky. As the Earth overtakes Mars the position of the red planet form one night to another among the stars slows and loops backward and then returns to it's normal direction (this takes several weeks or months).
A planet is said to travel in "retrograde" when its orbit appears to go in a backwards motion when viewed from certain perspectives on Earth. It is akin to a large-scale optical illusion. In reality, all planetary bodies follow the same directional trajectory around our sun.
Retrograde orbit is when an an object, like a satellite, goes around another object, like a planet, in the direction opposite the second object's rotation.
For example, Neptune's moon Triton goes around Neptune with a retrograde orbit. Rather than orbiting around Neptune in the same counter-clockwise direction Neptune rotates in, Triton orbits Neptune in a clockwise direction.
Retrograde is used in neuroscience to describe distal-proximal flow, movement, or transport in an axon toward its cell body, or degeneration of an axon proximal to a point of injury, such degenerative changes may extend to, and include, the cell body.
An example of this that the rabies virus can travel to the CNS via retrograde flow.
Going backwards- in reverse.
what does retrograde mean
The planets don't have to "do anything" to "go into" retrograde motion. The retrograde motion, the "moving backward" that planets do as we watch them cross the night sky over the weeks, is due to the nature of the orbit of a planet and to our view of that orbit from earth.
Superior planets are in opposition when in the middle of their retrograde motion.
The "apparent" reverse or backwards motion of a planet as observed from Earth. The innermost planets appear to have a retrograde motion when viewed from Earth.
no
Retrograde motion important in astronomy because it helped to explain that the planets revolved around the Sun. Retrograde motion is the ability of some objects to rotate in a direction that is opposite what is expected.
Mercury and Venus are the two planets that retrograde motion around the sun.
Venus and Uranus have retrograde rotation.There are other meanings of retrograde motion, but retrograde rotation fits the question best.
The planets don't have to "do anything" to "go into" retrograde motion. The retrograde motion, the "moving backward" that planets do as we watch them cross the night sky over the weeks, is due to the nature of the orbit of a planet and to our view of that orbit from earth.
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
Superior planets are in opposition when in the middle of their retrograde motion.
The retrograde motion of planets
All planets orbit the sun in the direction that the sun is rotating. There are actually two planets that rotate by retrograde motion and are exceptions to this rule. These planets are Venus and Uranus.
The "apparent" reverse or backwards motion of a planet as observed from Earth. The innermost planets appear to have a retrograde motion when viewed from Earth.
no
Retrograde motion important in astronomy because it helped to explain that the planets revolved around the Sun. Retrograde motion is the ability of some objects to rotate in a direction that is opposite what is expected.
Uranus and Venus are the two planets in our solar system that have a retrograde rotation. All of the planets orbit the Sun.
No, Ptolemy did.