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Sir William Herschel and the Discovery of Uranus

Sir William Herschel and the Discovery of Uranus

Tabea Tietz
On March 13, 1781, Sir William Herschel for the first time observed planet Uranus while in the garden of his house at 19 New King Street in the town of Bath, Somerset, England (now the Herschel Museum of Astronomy), but initially reported it (on April 26, 1781) as a “comet“. “A knowledge of the construction of the heavens has always been the ultimate object of my observations…” – William Herschel, Astronomical Observations relating…
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astronomy
Joseph von Fraunhofer and the Solar Spectrum

Joseph von Fraunhofer and the Solar Spectrum

Harald Sack
On March 6, 1787, German optician and physicist Joseph Fraunhofer – later enobled Ritter von Fraunhofer – was born. He is known for the discovery of the dark absorption lines known as Fraunhofer lines in the Sun‘s spectrum, and for making excellent optical glass and achromatic telescope objectives. Moreover, he is the name giver for the German Fraunhofer Society for the advancement of applied research. “In all my experiments I could, owing to…
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astronomy
The Discovery of the Four Galilean Moons

The Discovery of the Four Galilean Moons

Harald Sack
On January 7, 1610, physicist and astronomer Galileo Galilei turned his new telescope to the nocturnal sky to watch the planet Jupiter and discovered the eponymous four moons of Jupiter, Ganimede, Callisto, Io, and Europa although he is not able to distinguish the last two until the following day.[1,2] The Telescope Based only on uncertain descriptions of the first practical telescope which the Dutch lens maker Hans Lippershey [3] tried to patent in the Netherlands…
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astronomy
In Search for Exoplanets with the CoRoT Space Observatory

In Search for Exoplanets with the CoRoT Space Observatory

Tabea Tietz
On December 27, 2006, the European space observatory CoRoT was launched. CoRoT‘s two objectives are to search for extrasolar planets with short orbital periods, particularly those of large terrestrial size, and to perform asteroseismology by measuring solar-like oscillations in stars. CoRoT stands for COnvection ROtation and planetary Transits (French: COnvection ROtation et Transits planétaires) and is a space observatory mission led by the French Space Agency (CNES) in conjunction with the European…
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astronomy
The Gran Telescopio Canarias

The Gran Telescopio Canarias

Harald Sack
On July 14, 2007, the Gran Telescopio Canarias saw first light, also known as the Great Canary Telescope (GTC), located at the Roque de los Muchachos Observatory on the island of La Palma, in the Canaries, Spain. With an aperture of 10.4m, as of 2015, it is the world’s largest single-aperture optical telescope. It has a segmented mirror, i.e. an array of smaller mirrors designed to act as segments of a single…
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