Overheard: not full moon is not full

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

(Overheard during presentation introducing moon phases, showing a slide of a nearly full moon.)

Instructor: "So, which phase is this?"

Students: "Waxing gibbous?"

Instructor: (Beat.) "Are you sure? How do you know that this is not a full moon?"

Student: (Beat.) "Because it's not full?"

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