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"Because the moon orbits along an egg-shaped ellipse, not a circle, its distance from us changes. Today, the moon is approaching its nearest point to Earth, so it should look about 14 percent bigger and 30 percent brighter than this year's other full moons, according to NASA. Since the moon takes about 28 days to orbit Earth, it reaches its point of closest approach, called perigee, about once a month. But since the moon's orbit isn't a perfect oval — rather, it wobbles — some perigees are closer than others. Tomorrow's approach will be the closest the moon has come to Earth since 1993."
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