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The geocentric model could not explain which of the following observations made by early astronomers? Select the two correct answers.(1 point)

Responses

The stars appeared to move.
The stars appeared to move.

Mercury and Venus changed in appearance throughout the year.
Mercury and Venus changed in appearance throughout the year.

The planets had epicycles.
The planets had epicycles.

Mars and Jupiter appeared to move backwards for some period of time.

1 answer

The geocentric model could not explain the following observations made by early astronomers:

  1. Mercury and Venus changed in appearance throughout the year.
  2. Mars and Jupiter appeared to move backwards for some period of time.

These phenomena are better explained by the heliocentric model and the retrograde motion of planets.