 Moon Diameter Visually
Celestial body need to measure the device, which structure is described below. In past time designers used an aperture plate when drawing circles on the drawings. In addition to this is needed, one meter long piece of a cord. Parts are cheap. These are enough to determine the diameter of the Moon.
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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