Because the sun is made of gas, it does not rotate as a unified body, but instead different parts of it rotate at different speeds. Richard Christopher Carrington recorded observations of sunspots over a period of time, which revealed that they travelled in inconsistent ways. Due to his discoveries, he lent his name to 'Carringtonian rotation', a system for comparing locations on the sun over time, based on his calculation that the sun rotates every 25.38 days, which from Earth we see as 27.2753 days.
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Citation: Editors, Litencyc. "Differential nature of solar rotation discovered by Richard Carrington". The Literary Encyclopedia. First published 30 August 2013 [https://staging.litencyc.com/php/stopics.php?rec=true&UID=6326, accessed 23 November 2024.]