Astronomy quiz question: astrological sun-sign date discrepancy

Astronomy 210 Quiz 1, Spring Semester 2010
Cuesta College, San Luis Obispo, CA

Earth's __________ causes the discrepancy between astrological sun-sign dates and the dates when the sun is actually in front of certain zodiac constellations.
(A) rotation.
(B) revolution.
(C) precession.
(D) tilt.

Correct answer: (C)

Section 30676
(A) : 6 students
(B) : 20 students
(C) : 45 students
(D) : 9 students

Success level: 59% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.69