Because of a rare coincidence, the moon will appear about 14 percent larger when it rises in the east on Saturday. The moon will look larger than it has in 18 years. The occurrence is called a perigee, or the point on the moon's orbit at which the moon is closest to the earth. This point coincides with a full moon this year, producing a rare visual phenomenon.The forecast for Saturday is mostly cloudy, but keep an eye on the eastern horizon at sunset. Sunset will be at approximately 7:54 pm on Saturday.