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Sunspots were first observed telescopically in December 1610 by English astronomer Thomas Harriot. [13] His observations were recorded in his notebooks and were followed in March 1611 by observations and reports by Frisian astronomers Johannes and David Fabricius .
The sunspot activity of December 1610 was the first to be observed using the newly invented telescope, by Thomas Harriot, who sketched what he saw but did not publish it. [12] In 1611 Johannes Fabricius saw them, and published a pamphlet entitled De Maculis in Sole Observatis , which Galileo was not aware of before he wrote the Letters on Sunspots.
Gustav Spörer later suggested a 70-year period before 1716 in which sunspots were rarely observed as the reason for Wolf's inability to extend the cycles into the 17th century. Also in 1848, Joseph Henry projected an image of the Sun onto a screen and determined that sunspots were cooler than the surrounding surface. [28]
Astronomers observed sunspots with telescopes for the first time in 1610. At the same time, the sun was making an unusual transition into an extended period of weakened activity. ... Sunspots were ...
Sunspots were probably first drawn by an English monk John of Worcester on 8 December 1128. There are records of observing sunspots from 28 BC, but that is the first known drawing of sunspots, almost 500 years before the telescope. His drawing seems to come around solar maximum.
Thomas Harriot is recognized as the first person to observe sunspots in 1610 with the use of a telescope. [39] Harriot observed the sunspot with the use of a telescope in a direct and hazardous way. [40] Even though Harriot observed the Sun directly through his telescope, there were no recorded injuries to his eyes. [4]
His sketches captured sunspots, which helped astronomers determine that the solar cycles were still occurring as expected when Kepler observed them, rather than lasting for abnormally long amounts ...
Illustration of sunspots drawn by 17th-century German Jesuit scholar Athanasius Kircher. Soon after the invention of telescopes, in the early 1600s, astronomers began observing the Sun. Thomas Harriot was the first to observe sunspots, in 1610. Observers confirmed the less-frequent sunspots and aurorae during the Maunder minimum. [50]