28 relations: Allan Chapman (historian), Apochromat, Apparent magnitude, Barnsley, BBC, Celestron, Doncaster, England, F-number, H-alpha, Hoober Observatory, Hoober Stand, Lunar eclipse, Meteor shower, Mexborough, Newtonian telescope, Observatory, Refracting telescope, Rotherham, Schmidt–Cassegrain telescope, Software Bisque, South Yorkshire, Swinton, South Yorkshire, Takahashi Seisakusho, Todmorden, Vixen (telescopes), Wadham College, Oxford, Wentworth, South Yorkshire.
Allan Chapman FRAS (born 30 May 1946) is a British historian of science.
An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses.
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The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.
Barnsley (locally) is a town in South Yorkshire, England.
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The British Broadcasting Corporation (BBC) is the public-service broadcaster of the United Kingdom, headquartered at Broadcasting House in London.
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Celestron is a company based in Torrance, California, USA that manufactures telescopes and distributes telescopes binoculars, spotting scopes, microscopes, and accessories manufacture by its parent company, the Synta Technology Corporation of Taiwan.
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Doncaster (or (preferred locally)), is a large market town in South Yorkshire, England.
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England is a country that is part of the United Kingdom.
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In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil.
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H-alpha (Hα) is a specific deep-red visible spectral line in the Balmer series created by hydrogen with a wavelength of 656.28 nm, which occurs when a hydrogen electron falls from its third to second lowest energy level.
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J A Jones Hoober Observatory is a privately owned observatory located in South Yorkshire, England near to the villages of Hoober and Wentworth, North-northwest of Rotherham.
Hoober Stand is a high tower on a ridge in Wentworth, South Yorkshire in northern England.
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A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow).
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A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky.
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Mexborough is a town in the Metropolitan Borough of Doncaster in South Yorkshire, England.
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The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror.
An observatory is a location used for observing terrestrial or celestial events.
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A refracting or refractor telescope is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).
Rotherham is a large town in South Yorkshire, England, which together with its conurbation and outlying settlements to the north, south and south-east forms the Metropolitan Borough of Rotherham, with a recorded population of 257,280 in the 2011 census.
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The Schmidt–Cassegrain is a catadioptric telescope that combines a Cassegrain reflector's optical path with a Schmidt corrector plate to make a compact astronomical instrument that uses simple spherical surfaces.
Software Bisque, Inc. (formerly named Computer Assist Services) is an American company that develops telescope mounts and software used in astronomy.
South Yorkshire is a metropolitan county in the Yorkshire and the Humber region of England.
Swinton is a suburban town within the Metropolitan Borough of Rotherham, in South Yorkshire, England on part of the west bank of the River Don.
Takahashi Seisakusho is a Japanese manufacturer of telescopes and related equipment, such as eyepieces and mounts.
Todmorden (locally or) is a market town and civil parish in the Upper Calder Valley in Calderdale, West Yorkshire, England.
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Vixen is a Japanese company that makes telescopes, binoculars, spotting scopes and accessories for their products.
Wadham College is one of the constituent colleges of the University of Oxford in the United Kingdom.
Wentworth is a village and civil parish in the Metropolitan Borough of Rotherham in South Yorkshire, England.