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The rising full moon often looks larger than it really is. In fact, it is no larger when seen near the horizon than when it is seen overhead. Psychologists think this "moon illusion" might be due to the human eye and brain subconsciously comparing its size to foreground objects when close to the horizon.

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Jimmy Westlake: The harvest moon illusion

The first full moon of autumn traditionally is called the “harvest moon.” Watch for that big harvest moon to rise over the eastern mountains.

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