Dark spokes dance around Saturn's B ring

Tis the Season for Spokes
Dark spokes dance around Saturn's B ring in this series of movies comprised of images taken with Cassini's wide-angle camera.
This animation is a concatenation of spoke movies acquired by NASA¹s Cassini spacecraft in the second half of 2008 on Aug. 21, Sept. 19, Sept. 26, Oct. 11, and Nov. 25.
As Saturn nears equinox in August 2009 and the sun angle on the ring plane decreases, spokes become common sights in Cassini images, just as they were in Voyager images (See Saturn's rings - high resolution). The planet's orbital period is 29.5 years, so Saturn has nearly made one complete trip around the sun since the flybys of the two Voyager spacecraft in 1980 and 1981, allowing Cassini to closely match Voyager's viewing geometry.

More detail:
http://saturn.jpl.nasa.gov/video/videodetails/?videoID=186