NASA said May 5th's "supermoon" will look up to 14 percent larger and shine 30 percent brighter than all other full moons this year.
The best time to marvel at the rare sight is when the moon is rising or setting, NASA said, because low-hanging moons near the horizon tend to appear unnaturally large.
The "supermoon" phenomenon occurs when a full moon coincides with the moon's perigee -- or its closest approach to Earth, passing 221,802 miles (356,955 km) from our planet.
According to the National Oceanic and Atmospheric Administration (NOAA), the close passing is nothing to worry about, as the moon at perigee only pulls tide waters a few inches or centimeters higher than usual.
The last supermoon occurred in March 2011.
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