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the diameter of the sun is about 400 times that of the moon, and it out-masses the moon by about 27 million times, they are both approximately the same apparent size in our sky.
Either pi times the diameter or pi times twice the radius (which is the diameter)
These windows could get extremely large, but let's play with Andersen Windows' catalog. If you build a Norman window using Andersen's largest semicircle window, which is six feet wide, and their tallest twin double-hung window, which is 6'4" high, you get an area of 52.11 square feet.
the width of the cylinder
The diameter of a circle represent the distance across it when divided in half. 1 millimeter equals .04 inches (rounded to one significant figure). Therefore 12 mm equals .05 inches.