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Sunspots cannot only be used to measure the activity of the Sun but also its rotation. Since the 17th century the moving of sunspots across the solar disc was observed by astronomers and used to measure the equatorial rotation of the sun. These observations also led to the discovery that the Sun rotation was slower at higher latitudes than on the solar equator (= differential rotation of the Sun).
With the CESAR solar telescope, taking pictures every week, we can determine the solar differential rotation.