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Author Question: Describe what produces the retrograde motion of Mars. What geometric arrangements did Ptolemy use to ... (Read 38 times)

EY67

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on: Jul 14, 2018
Describe what produces the retrograde motion of Mars. What geometric arrangements did Ptolemy use to explain this motion?
 
  What will be an ideal response?

Question 2

Why are some satellites described as being stationary?
 
  A) Their orbital motion matches the earth's rotation and stay above the same site.
  B) They can only observe stationary weather systems.
  C) They have no orbital motion.
  D) They orbit over the earth's poles.


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iceage

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Reply #1 on: Jul 14, 2018
Answer to Question 1

The retrograde motion of Mars is due to Earth having a faster orbital speed than Mars. From the point of view of a stationary Earth, Mars appears to move backward, or retrograde. Ptolemy described this motion geometrically by proposing that the planets orbited on small circles (epicycles) revolving on large circles (deferents).

Answer to Question 2

A


EY67

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Reply 2 on: Jul 14, 2018
Thanks for the timely response, appreciate it

jamesnevil303

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Reply 3 on: Yesterday
Excellent

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