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http://en.m.wikipedia.org/wiki/Saturn's_hexagon

"...a persisting HEXAGONAL (my emphasis) cloud pattern around the north pole of Saturn...The sides of the hexagon are about 8,600 miles long, which is longer than the Earth's diameter. It rotates with a period of 10h 39m 24s, the same period as Saturn's radio emissions from its interior.  However, the hexagon does not shift in longitude like other clouds in the visible atmosphere."