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For the past few weeks, Mars has appeared to slow in its eastward trajectory, almost seeming to waver, as if it had become uncertain.
On Wednesday, July 30, that steady eastward course will come to a stop. Then, for the next two months, the planet will move backward against the star background - toward the west. On Sept. 29 it will pause again before resuming its normal eastward direction.
All the planets exhibit retrograde motion at one time or another.

2007-09-10 22:24:41 · 6 answers · asked by naddled 2 in Science & Mathematics Astronomy & Space

6 answers

Retrograde motion is most apparent when viewing planets that are outside our orbit. Mercury and Venus exhibit littlle retrograde motion to us , although an observer on those planets would see an apparent retrograde motion if they were looking at our planet. All you have to do is think geometrically.

Earh revolves around the sun in a smaller orbit and at a faster rate than the outer planets. At some point, the relative direction of orbits will be exactly opposite. They appear to move backwards through the star field.

The rising and setting of the sun is not a result of our orbit around it, but a result of earth's rotation. Draw a picture of the solar system and think your way through it.

2007-09-11 02:47:15 · answer #1 · answered by glinzek 6 · 0 0

Retrograde motion against the star background, but not retrograde orbit. And they never appear to be moving west to east in the sky. The Earth would have to change its direction of rotation for that. It would have to do the same for the sun to rise in the west.

2007-09-11 05:41:50 · answer #2 · answered by Choose a bloody best answer. It's not hard. 7 · 0 0

possibly. a cosmic anomaly of some sort would have to occur for that to happen

2007-09-11 09:01:16 · answer #3 · answered by Anonymous · 0 0

Anything can happen in this crazy universe.

2007-09-11 05:38:46 · answer #4 · answered by Anonymous · 0 0

Right there with Scott---- WHAT???

I think that you are mis-informed, my friend.

2007-09-11 08:55:58 · answer #5 · answered by B. 7 · 0 0

What???

2007-09-11 05:55:14 · answer #6 · answered by Anonymous · 0 0

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