pick a night when the moon is moderately near the horizon. Take a penny and place it in front of your eye, so that it blocks out the moon. Now, move the penny away from your eye, until the apparent angular size of the penny is that of the moon. Measure the distance between your eye and the penny in centimeters. Divide that number into 1.9 cm, which is the diameter of the penny. This is the angular size of the Moon in a unit called radians. Multiply by 57.9, and you've got the angular size of the moon in degrees. How big is the moon in degrees?
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