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Tele Vue once manufactured a 5" refracting telescope named the MPT, the Multi-Purpose Telescope. It had a fast f/4 ratio, and had an adjustable diaphragm that ranged from f/4 to f/20. Only a small number were made, with the last being kept by Televue to use as a final optical quality control for all eyepieces they make.
Mills Observatory is the first purpose-built public astronomical observatory in the UK, located in Dundee, Scotland. [1] Built in 1935, the observatory is classically styled in sandstone and has a distinctive 7 m dome, which houses a Victorian refracting telescope, a small planetarium, and display areas.
As long as the weather permits, the Observatory offers free public telescope viewing every night the observatory is open - usually beginning at 7:00 p.m. This includes the historic 12" Zeiss Refracting Telescope on the roof, and up to four portable telescopes placed outside offering views of visible celestial objects for the night.
In 1828 Sheldon Clark donated 1200 US dollars to Yale to procure a Dollond refracting telescope. [1] Yale's first observatory, the Atheneum, was founded in 1830, situated in a tower. From 1830 it housed Yale's first refractor, a 5-inch (130 mm) Dollond donated by Sheldon Clark. It was the largest in the United States at the time.
A new 2.5-m telescope is under construction at ASA, while its foundations and the telescope pillar have already been erected at OCM. Subsequent construction phases are expected in 2024–2026. There are also plans to build the Thirty Millimetre Telescope (TMMT), which will be the smallest telescope in the world, equipped with a professional ...
To make observations in the infrared spectrum, Webb must be kept under 50 K (−223.2 °C; −369.7 °F); otherwise, infrared radiation from the telescope itself would overwhelm its instruments. Its large sunshield blocks light and heat from the Sun, Earth, and Moon, and its position near the Sun–Earth L 2 keeps all three bodies on the same ...
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