Search results
Results from the WOW.Com Content Network
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 ...
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.
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.
German astronomer Johannes Kepler made sketches of sunspots in 1607 from his observations of the sun’s surface — and centuries later, the pioneering drawings are helping scientists solve a ...
Johannes first observed a sunspot on February 27, 1611; in Wittenberg in that year he published the results of his observations in his 22-page pamphlet De Maculis in Sole observatis..... [5] It was the first publication on the topic of sunspots. [6]
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.
[2] These observations were published in 1774 [3] and showed that sunspots were features on the solar surface, as opposed to minor planets or objects above it. Moreover, he observed what is now termed the Wilson effect: the penumbra and umbra vary in the manner expected by perspective effects if the umbrae of the spots are in fact slight ...
The first sketches of the Moon's topography, from Galileo's ground-breaking Sidereus Nuncius (1610), publishing his findings from the first telescopic astronomical observations. During the Renaissance, Nicolaus Copernicus proposed a heliocentric model of the solar system. His work was defended by Galileo Galilei and expanded upon by Johannes ...