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Area code 303 is the original area code assigned to the entire state when the first nationwide telephone numbering plan was created in 1947. Today it only serves the greater Denver Metropolitan Area. Area codes 720 and 983 are overlay codes for today's 303 numbering plan area (NPA). Area code 719 serves Colorado Springs and southeastern Colorado.
The Meade "ETX" series Maksutov-Cassegrain telescope (105mm aperture). Meade produces a line of Maksutov telescopes under their ETX series (Everybody's Telescope). They were first produced in 90 mm (3-1/2") Maksutov Cassegrain telescope in 1996. They range in size from 90 mm to 125 mm.
The telescope saw first light in 1894. [2] [3] As of 2018, the Denver Astronomical Society hosts several public outreach events at the observatory every month. [4] As it is located in a large metropolitan area, the observatory is heavily affected by light pollution, which limits its use in scientific research.
Pian dei Termini (near San Marcello Pistoiese), Italy Piwnice Ovservatory: 1945 Piwnice near Toruń, Poland Planetarium and Astronomical Observatory in Grudziądz: 1972 Grudziądz, Kujawsko-Pomorskie, Poland Plateau Astronomique de La Couronne: 2024 Cordes-sur-Ciel, Tarn, France Pollock Astronomical Observatory: 2004 Hunting Valley, Ohio, US
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It is located near the summit of Mount Blue Sky in the Arapaho National Forest approximately 60 kilometers (37 mi) west of Denver, Colorado (USA). At an elevation of 4,326 meters (14,193 ft), it is the third-highest optical/infrared observatory in the world, and was the highest until the Indian Astronomical Observatory opened in 2001.
The Meade LX200 is a family of commercial telescopes produced by Meade Instruments launched in 1992 with 8" (20.32 cm) and a 10" (25.4 cm) Schmidt–Cassegrain models on computerized altazimuth mounts. [1] [2] Two larger models, a 12" (30.48 cm) and a 16" (40.64 cm), quickly followed.
The ETX started out as a 90 mm (3-1/2") Maksutov Cassegrain telescope (first produced in 1996) and took advantage of high volume mass production and simplified optical and parts construction to open a new market for a cheap alternative to the very expensive Questar 3-1/2 Maksutov Cassegrain [1] [2] The ETX "line" has been expanded to 105 mm, and 125 mm Maksutov Cassegrains and achromatic ...