The "once in a blue moon" phenomenon does not necessarily mean the moon will look blue on Halloween. While the dark blue tone of an evening sky can affect the coloring we see, Earth's satellite will ...
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What Is a Blue Moon and When Is the Next One?
Blue moon is either the second full moon in a calendar month or the third in an astronomical season with four full moons. The phenomenon of a blue moon, despite its name, does not change the moon's ...
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