BETTINA HANSEN / THE SEATTLE TIMES
The moon, almost full, rises Thursday evening as seen from Highway 2, just east of Gold Bar. Saturday evening will bring a "supermoon," so-called because it will appear to be unusually big. A supermoon occurs when our celestial neighbor is relatively close to Earth. When it's close and full, the moon appears bigger and brighter than normal. Saturday's moonrise will be at 9:02 p.m., according to the National Weather Service. Supermoons are not rare. Two other full moons, Aug. 10 and Sept. 9, will also be supermoons. There were three in a row last year, too.