Whether Mars will rise in eastern horizon or western horizon, given that it has a retrograde motion.
Answer to Problem 1CC
Solution:
It will rise in the eastern horizon.
Explanation of Solution
Introduction:
When a planet is moving retrograde, after observing the planet night after night, it seems to be drifting from east to west compared to the stars that are far away.
Explanation:
If a planet or Mars is moving in a retrograde motion, after observing it night after night, it seems to be drifting from east to west compared with background stars which are far away. This motion of Mars is typically opposite to that which should be shown by a planet. Irrespective of this slow relative movement, all objects appear to rise in eastern horizon and set in western horizon on a daily basis due to Earth's rotation.
Conclusion:
Hence, Mars rises in the eastern horizon and sets in the western horizon.
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