Cuesta College, San Luis Obispo, CA
The image at right[*] posted on the Instagram account of the U.S. Department of the Interior depicts a moon low above a horizon during the day. Discuss whether or not this moon image is plausible, and how you know this. Support your answer using a diagram showing the positions of the sun, the moon, Earth, and an observer on Earth. [*] instagram/p/mYnT4Ngu04/.
Solution and grading rubric:
- p:
Correct. The waning gibbous moon (more than the left half of the moon is lit up) is highest overhead at 3:00 AM, and would have risen six hours before at 9:00 PM, and set six hours later at 9:00 AM. In order for this picture to have been taken during the day, the time would need to sometime between after sunrise at 6:00 AM, and when the waning gibbous moon would set at 9:00 AM. Complete diagram and reasoning. - r:
Nearly correct (explanation weak, unclear or only nearly complete); includes extraneous/tangential information; or has minor errors. Diagram and/or explanation has minor errors. - t:
Contains right ideas, but discussion is unclear/incomplete or contains major errors. Problems with either diagram or discussion. - v:
Limited relevant discussion of supporting evidence of at least some merit, but in an inconsistent or unclear manner. Diagram and discussion problematic. - x:
Implementation/application of ideas, but credit given for effort rather than merit. - y:
Irrelevant discussion/effectively blank. - z:
Blank.
Section 30676
Exam code: midterm01sh3P
p: 28 students
r: 8 student
t: 9 students
v: 3 students
x: 4 students
y: 0 students
z: 0 students
A sample "p" response (from student 3562):
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