An Introduction to Natural Philosophy Designed As a Textbook in Physics for Th
An Introduction to Natural Philosophy Designed As a Textbook in Physics for Th
Denison Olmsted
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Our estimate of distance is more correct when many objects intervene. Hence it is that we are able to place that part of the sky which is near the horizon further from us than that which is over our heads. The apparent sky is not a hemisphere, but a flattened semi-ellipsoid. 469. Magnitude and Distance Associated. Our judg- ments of distance and of magnitude are closely associated. If objects are known, we estimate their distance by their visual angle, as has been stated ; but if unknown, we mu...st first acquire our notion of their distance by some other means, and then their visual angle gives us a definite impression as to their size. And if our judgment of distance is erroneous, a corresponding error attaches to our estimate of their magnitude. An insect crawling slowly on the window, if by mistake it is supposed to be some rods beyond the window, will appear like a bird flying in the air, The moon near the horizon seems larger than above us, because we are able to locate it at a greater distance.
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