How many degrees a sunspot located near the equator (rotation period is 25 days) will overtake another sunspot located at a latitude of 30 degrees (period of 26.3 days) in one revolution.
Let both spots first be located on the central meridian of the Sun, that is, the line connecting both poles and passing through the visible center. If a spot with a greater latitude rotates more slowly, then let it be on the central meridian in 26.3 days. This means that the spot located at the equator will overtake the first spot by an arc, which it will pass in another 1.3 days. During the day, the equatorial spot passes an arc of
360/25 = 14.4
In 1.3 days, the equatorial spot will shift by 14.4 * 1.3 = 18.7.
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