The Retrograde Motion of Planets
After completing the sketching activity on the apparent motion of the planet mars, complete the following survey for credit.
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What is the actual movement of Mars from January to August?
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To an observer on Earth, what is the movement of Mars from January through August?
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During which months does Mars seem to be regarding (moving backwards) in its orbit?
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Observe what Earth and Mars are doing in their orbits while retrograde motion is occurring. What seems to cause Mars to appear to move backwards?
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From the observer on Earth, do all the planets undergo retrograde motion during some part of their orbit?
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Why would it be difficult to observe the retrograde motion of Mercury and Venus?
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