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The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
Both the telescopes and the mounts, despite being sought-after, are manufactured in small numbers on an irregular basis. None are maintained in stock, and all typically have long lead times. When available on the used market, Astro-Physics' telescopes and mounts command high prices, telescopes often selling for multiples of their original cost.
The company became briefly famous in 1973 when Comet Kohoutek approached Earth and the company sold out of telescopes, a fact that made national news. [2] Neil deGrasse Tyson would later comment that "The Edmund Scientific catalog was a geek's paradise. At a time when no one had access to lasers, they had them for sale." [2]
The Astroscan was a wide-field 4⅛" clear-inch (105mm) diameter reflecting telescope, originally produced by the Edmund Scientific Corporation, that was for sale from 1976 to 2013. Design [ edit ]
The mirrors themselves can be larger than the aperture, and some telescopes may use aperture synthesis through interferometry. Telescopes designed to be used as optical astronomical interferometers such as the Keck I and II used together as the Keck Interferometer (up to 85 m) can reach higher resolutions, although at a narrower range of ...
Space telescope: instrument in space to study astronomical objects; Spectrometers: used to measure spectral components of light; Sundial: device that tells the time of day by the apparent position of the Sun in the sky; Transit instrument: small telescope used for precise astrometry
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