Supermoon Saturday

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By Catherine Holland By Catherine Holland

PHOENIX -- If the moon looks bigger and brighter Saturday, it's not because you've had too many margaritas. 

This year, Cinco de Mayo also marks the date of the annual supermoon. The moon will officially be full at 8:35 p.m., but it will look pretty impressive all evening and into the early morning hours. That's because not only will the moon be full, but it will also be at its closest spot in its orbit around the Earth. 

Because it will be closer (only 221,802 miles away), skywatchers will be treated to a moon that appears about 16 percent brighter and 30 percent bigger than usual. The picture above was shot two days before the supermoon, also called the perigee moon.

In contrast, the full moon will be at its farthest point from Earth in late November. It will appear smaller then and is called the apogee moon.

The supermoon will bring unusually high and low tides this weekend.

Some people believe the phenomenon is associated with an increased risk of earthquakes and volcanic eruputions, but there isn't much evidence for that. 

If you miss Saturday's supermoon, you won't be able to catch the next one until June of next year.

Be sure to share your pictures of the supermoon on! We'd love to see them!

Check it out: Photos of the last supermoon -- March 2011