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Overview         (For age - group : Below 16 )

Whenever a moon is seen near the horizon it is a big disc as it rises does it really become smaller ? No, this is just an illusion ... but how to establish the truth?

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Bigger Moon or nature's illusion?

moon looks bigger near horizon moon looks smaller
Moon looks bigger nearer to the horizon
Moon starts" looking smaller" as it rises up in the sky
Details of the animation/ movie /software

The moon looks bigger when we see it behind tall trees or buildings and are able to make a size comparison. Our eyes are unable to adjust for the true distance of the moon from the trees and buildings, and we make our comparison as if the moon were merely a little distance behind the trees.
After the moon is up in the sky, we however have no object with which to compare its size. So it appears smaller.

The size of any object depends upon the angle they subtend at our eyes. The moon in both the cases subtends equal angle at our eyes. Its only that we see the size of objects relative to some other object.

If you are still unclear about the concepts, please refer the animation below.

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