Question

How did the movement of sunspots on the surface of the sun affect peoples' beliefs about astronomy at the time?​

Answer 1

Some thought they were shadows of undiscovered planets crossing the Sun, while others believed they were dark clouds in the Sun's atmosphere. The movement of sunspots across the face of the Sun allowed astronomers in the early 1600's to make the first estimates of the Sun's rotation period (about 27 days).