Astronomy 210 Quiz 2, spring semester 2013
Cuesta College, San Luis Obispo, CA
Ptolemy's model explained the retrograde motion of a planet by:
(A) disregarding parallax.
(B) moving it on a circle that itself moves around Earth.
(C) using elliptical instead of circular orbits.
(D) having it orbit at a different speed than Earth's orbit around the sun.
Correct answer: (B)
Ptolemy's geocentric model of planetary motion features Earth at (or very near) the center of a circular deferent, along which has a planet moving along a circular epicycle. Response (D) describes Copernicus' heliocentric model of planetary motion.
Section 30674
Exam code: quiz03Ne3v
(A) : 1 student
(B) : 14 students
(C) : 7 students
(D) : 9 students
Success level: 48% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.68
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