Cuesta College, San Luis Obispo, CA
[20 points.] Shown at right is an excerpt from a comic strip* printed on March 23, 2008. Discuss what hour it is if the Moon is highest overhead with this phase, using a diagram showing the positions of the Sun, Moon, and Earth. *The Family Circus, Bill Keane, ©King Features Syndicate, Inc.
Solution and grading rubric:
- p = 20/20:
Correct. Phase as shown is waning crescent, which is highest overhead at 9 AM (rises at 3 AM, and sets at 3 PM). Explanation includes a complete Sun-Moon-Earth diagram. - r = 16/20:
Nearly correct (explanation weak, unclear or only nearly complete); includes extraneous/tangential information; or has minor errors. Diagram is correct, but time is wrong. - t = 12/20:
Contains right ideas, but discussion is unclear/incomplete or contains major errors. At least has a serious attempt at a Sun-Moon-Earth diagram. - v = 8/20:
Limited relevant discussion of supporting evidence of at least some merit, but in an inconsistent or unclear manner. May involve lunar eclipses. - x = 4/20:
Implementation/application of ideas, but credit given for effort rather than merit. - y = 2/20:
Irrelevant discussion/effectively blank. - z = 0/20:
Blank.
Section 70158
p: 36 students
r: 7 students
t: 21 students
v: 13 student
x: 0 students
y: 1 student
z: 0 students
A sample "p" response (from student 1616):
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