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jupiter
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".
Planet retrograde is when the planet appears, from the Earth point of view, to be orbiting opposite from its normal direction around the sun. Basically, it looks like its going backwards. It usually occurs when Earth overtakes a planet in its orbit. This video here at the link below shows a good example of what retrograde looks like. The top part of the video shows the movement we see from Earth while the bottom shows the planet's actual movement.
bending backwards
The planet that does not get colder when further away from the sun is Venus as it rotates backwards.
rotary motion
Apparent retrograde motion.
The name of the path a planet occupies in its movement around the Sun is called an orbit. The shape of the path is an ellipse, with the Sun at the focus. Due to the inverse-square rule of gravity, the speed of movement is greater in orbits closer to the sun, slower for more distant orbits.
jupiter
Retrograde Motion
Retrograde Motion
forwards and backwards
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".
Planet retrograde is when the planet appears, from the Earth point of view, to be orbiting opposite from its normal direction around the sun. Basically, it looks like its going backwards. It usually occurs when Earth overtakes a planet in its orbit. This video here at the link below shows a good example of what retrograde looks like. The top part of the video shows the movement we see from Earth while the bottom shows the planet's actual movement.
Time can never go backwards. You may be thinking of a planet which rotates in the opposite direction to Earth. Venus and Uranus do this.
A backwards one. -_-
Reverse peristalsis is a type of movement only seen in the large intestine. It happens if the rectum is full, but not emptied. It sends fecal matter backwards into the colon.