## 20120206

### Astronomy quiz question: Ursa Major/Cassiopeia position

Astronomy 210 Quiz 1, spring semester 2012
Cuesta College, San Luis Obispo, CA

[Version 1]
Consider the view of the northern horizon shown below, as seen by an observer on February 2 in San Luis Obispo, CA. Ignore daylight saving time. Assume you can see stars in daylight. What time is this?
(A) 5:00 AM.
(B) 10:00 AM.
(C) 12:00 PM.
(D) 9:00 PM.

Response (A) has Cassiopeia at its lowest point in the sky on February 2; response (C) corresponds to the sky on January 1; and response (D) has Cassiopeia to the left (west) of Polaris on February 2.

Section 30676
Exam code: quiz01sH0p
(A) : 1 student
(B) : 39 students
(C) : 2 students
(D) : 6 students

Success level: 83% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.46

[Version 2]
Consider the view of the northern horizon shown below, as seen by an observer on February 2 in San Luis Obispo, CA. Ignore daylight saving time. Assume you can see stars in daylight. What time is this?
(A) 10:00 AM.
(B) 12:00 PM.
(C) 2:00 PM.
(D) 9:00 PM.

Response (B) corresponds to the sky on January 1; response (C) has Ursa Major at its lowest point in the sky on February 2; and response (D) has Ursa Major to the right (east) of Polaris on February 2.

Section 30674
Exam code: quiz01n3Wb
(A) : 27 students
(B) : 1 student
(C) : 0 students
(D) : 4 students
(No response : 1 student)

Success level: 79% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.22