Fabricius’ treatise on sunspots

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...

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