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How to Solve
This is a hands-on exercise in optical geometry.
1. Metadata: You need to know the camera settings to establish the geometry.
2. Calculations: You will need to calculate the Field of View using the focal length and
sensor size, then determine how much of that frame the moon occupies.
3. Verification: Apply the angular size formulas to see if your measured moon size
matches the known value of ~0.5°.