A full moon rises over San Francisco. Image: SF Brit/Flickr

When tonight’s full moon makes its debut (as well as a lunar eclipse for just about everyone in the world except for North America) it will appear unusually large. However this moon illusion is all in your head as Mother Nature Network explained, “the moon isn’t changing sizes, and while its distance from Earth does change slightly over time — producing an occasional “supermoon,” which really does appear up to 14% larger than usual — that happens too slowly to yield such a dramatic transformation in one night.”

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