 The Diameter of the Moon Visually
 Set 10 mm = 1 centimeter hole of the aperture plate, 111 cm off the eye. Any 10 mm hole is suitable for this. The moon locates exactly in the hole. Calculate the diameter of the moon on the basis of the information. The moon is an average of 384 400 km away from the earth. Moon's diameter as literature it say, 3470 km. Measuring error 0.2 %. The example provides an idea of a straight linear proportionality.
1 cm = x => x = 3463 km
111 cm 384 400 km
1 - 1,12 - 1,25 - 1,6
29.4.2015*11:20 (1019 - 288)
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