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SlideshowReport

The Sun’s Rotation

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.
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