The moon will appear slightly larger and brighter Monday night during what's known as a supermoon.

October's supermoon is the first of three this year. It happens when a full moon is closer to Earth in its orbit. That makes the moon look up to 14% bigger and 30% brighter than the faintest moon of the year, according to NASA . The subtle difference happens a few times a year, sometimes coinciding with other astronomical events such as lunar eclipses.

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“It's not really very unusual,” said Derrick Pitts , chief astronomer with the Franklin Institute in Philadelphia.

Everyone in the world can see a supermoon without special equipment if clear skies permit. But the difference can be tough to discern, especially i

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