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    Planetary motions

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    Please help with the following problem.

    Every night, all stars and planets rise in the _______ and set in the ________. What direction do the planets normally move in across the sky with respect to the background stars (prograde motion)? What is retrograde motion, and why do we see it?

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    Solution Preview

    Problem: Every night, all stars and planets rise in the _______ and set in the ________. What direction do the planets normally move in across the sky with respect to the background stars (prograde motion)? What is retrograde motion, and why do we see it?

    Solution:
    Here are your answers ...
    ? No matter where you are on Earth, all stars/planets/sun/moon they all rise in the eastern sky and set in the westerns sky twelve or so hours later as Earth spins in space from west to east. So... east / west is your answer.
    ? The word "Planet" was given to a ...

    Solution Summary

    Planetary motions are described in this solution. It discusses the direction the planets normally move in across the sky with respect to the background stars.

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