Galileo was the first to discover how fast the Sun spins by studying the movement of sunspots. The Sun spins? You bet! Even more amazing, some parts of the Sun spin faster than others.
If you were to measure very carefully every day the position of sunspots at different latitudes, you would notice that the sunspots nearest the equator are moving the fastest.
Can you work out the rotation time of the Sun from these pictures?
Here is a movie made from Galileo's drawings.
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