William Herschel

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Herschel's early observational work soon focused on the search for pairs of stars that were very close together visually. Astronomers of the era expected that changes over time in the apparent separation and relative location of these stars would provide evidence for both the proper motion of stars and, by means of parallax shifts in their separation, for the distance of stars from the Earth. The latter was a method first suggested by Galileo Galilei. From the back garden of his house in New King Street, Bath, and using a 6. 2-inch aperture (160 mm), 7-foot-focal-length (2. 1 m) (f/13) Newtonian telescope "with a most capital speculum" of his own manufacture, in October 1779, Herschel began a systematic search for such stars among "every star in the Heavens", : 5  with new discoveries listed through 1792. He soon discovered many more binary and multiple stars than expected, and compiled them with careful measurements of their relative positions in two catalogues presented to the Royal Society in London in 1782 (269 double or multiple systems) and 1784 (434 systems). A third catalogue of discoveries made after 1783 was published in 1821 (145 systems).

William Herschel - Wikipedia
William Herschel - Wikipedia
William Herschel, Stargazing, Astronomer, Stargazer ...
William Herschel, Stargazing, Astronomer, Stargazer ...
Sir William Herschel Painting | Lemuel Francis Abbott Oil ...
Sir William Herschel Painting | Lemuel Francis Abbott Oil ...
William Herschel - Video Learning - WizScience.com - YouTube
William Herschel - Video Learning - WizScience.com - YouTube
William Herschel, Astronomer Photograph by Paul D Stewart
William Herschel, Astronomer Photograph by Paul D Stewart
Sir William Herschel Photograph by Royal Astronomical ...
Sir William Herschel Photograph by Royal Astronomical ...
William Herschel, British Astronomer Photograph by Maria ...
William Herschel, British Astronomer Photograph by Maria ...
William Herschel, German-british Photograph by Science Source
William Herschel, German-british Photograph by Science Source
Sir William Herschel IMAGE Public Domain Clip Art Photos ...
Sir William Herschel IMAGE Public Domain Clip Art Photos ...
Sir William Herschel (Frederick) 1738-1822 German Born ...
Sir William Herschel (Frederick) 1738-1822 German Born ...
Posterazzi: Sir William Herschel N(1738-1822) English ...
Posterazzi: Sir William Herschel N(1738-1822) English ...
William Herschel, German-british Photograph by Science Source
William Herschel, German-british Photograph by Science Source
Biografia di William Herschel
Biografia di William Herschel
The Stargazer’s Sister by Carrie Brown - Due out in ...
The Stargazer’s Sister by Carrie Brown - Due out in ...
Wie heeft Uranus ontdekt? | Kuuke's Sterrenbeelden
Wie heeft Uranus ontdekt? | Kuuke's Sterrenbeelden
Portrait of the astronomer William Herschel - Stock Image ...
Portrait of the astronomer William Herschel - Stock Image ...
A Short History of Astronomy (1898)/Chapter 12 ...
A Short History of Astronomy (1898)/Chapter 12 ...
William Herschel Biography – Fasts, Childhood, Family Life ...
William Herschel Biography – Fasts, Childhood, Family Life ...
Planet George
Planet George
Sir William Herschel (1738-1822) posters & prints by ...
Sir William Herschel (1738-1822) posters & prints by ...
Ezo Oaza: Uran
Ezo Oaza: Uran
The Unusual Siblings: Astronomers William and Caroline ...
The Unusual Siblings: Astronomers William and Caroline ...
Great Creation Scientists Sir William Herschel - creation.com
Great Creation Scientists Sir William Herschel - creation.com
NPG 4055; Sir William Herschel - Portrait - National ...
NPG 4055; Sir William Herschel - Portrait - National ...
March 13th 1781: Uranus discovered | todayinhistoryblog
March 13th 1781: Uranus discovered | todayinhistoryblog
Sir William Herschel 1738-1822 Photograph by Ken Hodges
Sir William Herschel 1738-1822 Photograph by Ken Hodges

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