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Immediately after turning telescopes on the heavens, astronomers discovered spots on the Sun. The Englishman Thomas Harriot was perhaps the first to see sunspots in December 1609, but others like
Astronomer Johannes Fabricius published a 22-page pamphlet in June 1611. This pamphlet, the dedication for which was dated June 13, 1611, is the first published treatise on sunspots. A.S.Ganesh takes a look at Fabricius, who was among the first to observe sunspots using a telescope, and the first to identify them as such.