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| Description: The Sun’s Rotation This series of photographs taken in 1999 shows the same sunspot group over one-third of a solar rotation. Note how the sunspot groups changed over this time. By observing a group of sunspots from one day to the next in this same manner, Galileo found that the Sun rotates once in about 4 weeks. Sunspot activity also reveals the Sun’s differential rotation: The equatorial regions rotate faster than the polar regions. Picture Stats: Views: 546 Filesize: 144.38kB Height: 900 Width: 696 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18357 |