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Updated: August 22, 2026
When the eye-to-frame distance is eighteen inches, the diameter of the disc of the moon on the smeared glass will occupy exactly 1/115th of eighteen inches, which is between one-sixth and one-seventh of an inch. That seems to be an important fact for painters of sun-sets and moon-rises. But what do they do? They give to a high moon, if they are very careful, a quarter of an inch for diameter.
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