What Was Ptolemy's Solution to the Problem of Retrograde Motion

question 30

Multiple Choice

What was Ptolemy's solution to the problem of retrograde motion in a geocentric Universe?

• A) That each planet moves in small circles called epicycles as it follows its larger orbit
• B) That some of the celestial spheres really did slow and reverse direction regularly
• C) That some planets could slide around on the celestial spheres
• D) That observations of retrograde motion had been made incorrectly

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