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Answered 2008-12-14 16:49:30

What causes the motion of planets?

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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.

Mercury and Venus are the two planets that retrograde motion around the sun.

Retrograde motion is called an apparent motion because it is the opposite direction to the movement of something.

YES. There are several meanings to "retrograde" in astronomy. In this case, I am assuming you mean the apparent "backwards" orbital motion of a planet that is sometimes seen. This is very obvious in the case of Mars. Also, all the outer planets show this "apparent retrograde motion". It's easy to forget, but Mercury and Venus also show this behaviour, but in a slightly different way.

It held that the planets moved along small circles that moved on larger circles around Earth.

Venus and Uranus have retrograde rotation.There are other meanings of retrograde motion, but retrograde rotation fits the question best.

The so-called 'inferior' planets ... Mercury and Venus ... don't exhibit retrograde motion. Since both of them orbit the sun at smaller average distance than the earth does, both of their orbital periods or 'years' are shorter than the earth's year. The earth never overtakes and passes either of them ... the maneuver that causes the apparent retrograde motion of the other, so-called 'superior', planets.

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.

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

The retrograde motion of planets

The Sun's apparent motion among the stars is from West to East - just like the motion of the Moon, and the predominant motion of the planets (planets sometimes go from East to West, too - in this case they are said to be retrograde).

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.

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,.

No. Venus and Uranus are the only planets with retrograde motion, in the solar system.

Venus, Uranus and the dwarf planet Pluto rotate in a retrograde motion.

The more distant outer planets retrograde more frequently than the inside planets. Therefore, Saturn has retrograde motion more frequently than Jupiter.

Retrograde motion was explained in Ptolemy's model by the use of epicycles in the planets' orbits.

Uranus and Venus are the two planets in our solar system that have a retrograde rotation. All of the planets orbit the Sun.

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.

A planet that is retrograde means that the planet was making an apparent backward motion at the time of birth. If a planet was retrograde at the time of birth, then that planet is notated in the natal chart with an Rx by the astrologer. Planets never move backwards, hence the term apparent. The Sun and Moon never retrograde. Many people watch the motion of current retrograde planets, especially Mercury. The energy of a retrograde planet is expressed more on an inner level Sometimes the individual has difficulty expressing the energy outwardly. Some part of that planets energy is held back. Retrograde planets often cause one to stop and reconsider the consequences, so that spontaneous expression is blocked in some way. At other times, the outward behavior becomes exaggerated in an attempt to reconcile the inner doubts. Here are some examples of how retrograde planets may manifest in a persons chart.

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.

All planets rotate. Some rotate in a retrograde motion compared to Earth. Venus and Uranus rotate in a retrograde motion.

That is called 'apparent retrograde motion'.See the related link listed belowfor more information.

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