Moon Illusion

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For many centuries scientientist have been puzzled by the common illusion that the rising of the moon at the horizon looks bigger than it looks later on in the day and for the past nine centuries they have know that angular subtense of the moon's horizontal (azimuth) diameter always measures about 0.52 degrees at an earthly observation point no matter where the moon is in the sky. For more than 100 years, various scientists interested in visual perception (a specialty within psychology) have conducted experiments on the moon illusion . And they said the distance theory have suggested two different reasons why the horizon moon would look farther away than the zenith moon. The most popular version of the theory appeals to the ancient idea of a "sky dome illusion" …show more content…

But yet its rarely is mentioned in popular articles about the moon illusion. For instance, a recent study by L. Kaufman and J. Kaufman (2000) that somehow became widely publicized in the popular press, claimed to offer support for the apparent distance theory, but it did not (could not) deal with the fatal contradiction. The solution to properly describing most peoples' moon illusion and removing the "paradox" is to realize that the phrase "looks larger" refers, first of all, to the angular size, and secondarily may also refer to the linear size, as discussed next.During viewing of a distant object, some closer objects near the line of sight can make the eyes adjust to a short distance and induce micropsia for the distant object (and all objects). This occurs especially when one is looking through a window screen or a wet windshield (see Roscoe, 1989). Many anecdotal reports published over the last 100 years have indicated that a majority of people say simply that the horizon moon either "looks larger and closer" than the zenith moon, or "looks larger and at the same

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