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MMLU / Why did Ptolemy have the planets orbiting Earth on ‘circles upon circles’ in his…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

Why did Ptolemy have the planets orbiting Earth on ‘circles upon circles’ in his model of the universe?

choices

  1. To explain why more distant planets take longer to make a circuit through the constellations of the zodiac.
  2. To explain the fact that planets sometimes appear to move westward rather than eastward relative to the stars in our sky.
  3. To explain why the Greeks were unable to detect stellar paralax.
  4. To properly account for the varying distances of the planets from Earth.

subject

astronomy

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