According to Ptolemy's model of the movement of celestial bodies,
A. the earth rotates around the sun.
B. the sun is the center of the universe.
C. the earth rotates around the moon.
D. planets orbit in circular paths around the earth.
Ptolemy (like nearly all scientists at the time) believed in a geocentric universe - that is, one in which the earth is the center. Therefore, "D. planets orbit in circular paths around the earth." is the correct answer.
