Cuesta College, San Luis Obispo, CA
[20 points.] An astronomy question on an online discussion board(*) was asked and answered:
wakeflaw...: It's noon and the [m]oon is full. Where is the moon in the sky?Discuss whether or not this answer is correct, and how you know this. Support your answer using a diagram showing the positions of the sun, moon, Earth, and an observer on Earth.
Renaissance...: On the opposite side of the world.
Solution and grading rubric:
- p = 20/20:
Correct. The full moon is highest overhead for an observer at midnight on Earth, which on the opposite side of Earth as the noon observer. Correct diagram and reasoning.
- r = 16/20:
Nearly correct (explanation weak, unclear or only nearly complete); includes extraneous/tangential information; or has minor errors.
- t = 12/20:
Contains right ideas, but discussion is unclear/incomplete or contains major errors. Problems with either diagram or discussion.
- v = 8/20:
Limited relevant discussion of supporting evidence of at least some merit, but in an inconsistent or unclear manner. Substantive discussion, but missing/problematic diagram.
- x = 4/20:
Implementation/application of ideas, but credit given for effort rather than merit. Problematic discussion, diagrams with the moon orbiting the sun, etc.
- y = 2/20:
Irrelevant discussion/effectively blank.
- z = 0/20:
Exam code: midterm01sg5U
p: 16 students
r: 7 students
t: 7 students
v: 4 students
x: 3 students
y: 0 students
z: 0 students
A sample "p" response (from student 1131):
Another sample "p" response (from student 9275):
A sample "t" response (from student 1863):
A sample "x" response (from student 2319):