Low-Hanging Full Moon.

This weekend's full moon hangs lower in the sky than any other full moon of 2007, according to NASA, and it's a good time to be fooled.

When low on the horizon, the Moon can appear to be larger than when it's higher in the sky. It's all an illusion, scientists say, and it does not involve any enlarging effects of the atmosphere. Rather, it's all in your mind.

You can see this illusion Friday, Saturday, and Sunday evenings. Link

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I think the optical illusion is the other way around. With the moon high in the sky, there is nothing to compare with it, so we make it smaller. When it is on the horizon, we see just how large it is.
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