The News, Culture and Practice of Sailing woodenboats
in Australia, New Zealand & The South Pacific.
How Far to the Mark?
The brain uses this positional disparity automatically in everyday life to gain a depth of perception. Measuring distance by the rule of thumb relies on leveraging the known dimensions of the outstretched arm and the distance between the eyes. Your arm is typically 10 times as long as the distance between your eyes.
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