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Galileo Galilei almost certainly began telescopic sunspot observations around the same time as Harriot, given he made his first telescope in 1609 on hearing of the Dutch patent of the device, and that he had managed previously to make naked-eye observations of sunspots. He is also reported to have shown sunspots to astronomers in Rome, but we ...
Sunspots expand and contract as they move across the surface of the Sun, with diameters ranging from 16 km (10 mi) [3] to 160,000 km (100,000 mi). [4] Larger sunspots can be visible from Earth without the aid of a telescope. [5] They may travel at relative speeds, or proper motions, of a few hundred meters per second when they first emerge.
Soon after, in 1609 and 1610 respectively, Harriot turned his attention towards the physical aspects of the Moon and his observations of the first sightings of sunspots. [4] In early 1609, he bought a "Dutch trunke" (telescope), invented in 1608, and his observations were among the first uses of a telescope for astronomy.
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.
At left is the first cubical version of the original Sunspotter solar telescope, first built in 1978 by the late inventor Daniel R. Janosik Sr. who built them from his home in Pike County.
Schwabe obtained his first telescope through a lottery in 1825 and began his observations on sunspots from 30 October 1825. [2] In 1826 he obtained a better telescope, a 4.8-in. Fraunhofer refractor that was used by Wilhelm Lohrmann to map the Moon. From 1829 he was completely involved in scientific work.
Arthur Edwin Covington (21 September 1913 – 17 March 2001) was a Canadian physicist who made the first radio astronomy measurements in Canada. Through these he made the valuable discovery that sunspots generate large amounts of microwaves at the 10.7 cm wavelength, offering a simple all-weather method to measure and predict sunspot activity, and their associated effects on communications.
German astronomer Johannes Kepler used a projecting device in 1607 to help him sketch the sunspots he saw just a few years before the first telescopic observations of the features.