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The observatory's main feature was its large radio telescope, whose main collecting dish was an inverted spherical dome 1,000 feet (305 m) in diameter with an 869-foot (265 m) radius of curvature, [22] constructed inside a karst sinkhole. [23]
The Perth Observatory is the name of two astronomical observatories located in Western Australia (WA). In 1896, the original observatory was founded in West Perth on Mount Eliza overlooking the city of Perth (obs. code 319).
Concept sketch of David Dunlap Observatory. The DDO owes its existence almost entirely to the efforts Clarence Chant. [3] Chant had not shown an early interest in astronomy, but while attending University College, University of Toronto, he became interested in mathematics and physics, eventually joining the university as a lecturer in physics in 1892. [4]
The Arecibo Telescope was a 305 m (1,000 ft) spherical reflector radio telescope built into a natural sinkhole at the Arecibo Observatory located near Arecibo, Puerto Rico. A cable-mount steerable receiver and several radar transmitters for emitting signals were mounted 150 m (492 ft) above the dish .
The Snow Solar Telescope was the first telescope installed at the fledgling Mount Wilson Solar Observatory. It was the world's first permanently mounted solar telescope. Solar telescopes had previously been portable so they could be taken to solar eclipses around the world. The telescope was donated to Yerkes Observatory by Helen Snow of Chicago.
The observatory's main dome houses a 40 in-diameter (102 cm) doublet lens refracting telescope, the second-largest refractor ever successfully used for astronomy. The largest lens is the Swedish 1-m Solar Telescope. There are several smaller telescopes – some permanently mounted – that are primarily used for educational purposes.
The Great Refractor dome, 2013 Dome of the Royal Observatory Greenwich 28-inch refractor, circa 1900. The dome for the older, smaller telescope was taken down in 1892, and the new, larger dome for the 28-inch was finished by 1893. [7] The older dome for the 12.8 inch refractor has been called a 'drum dome' whereas the 28-inch is called the ...
On its centenary anniversary, telescope and dome were fully renewed. The Zeiss telescope, still meeting today's demands, was dismantled in March 2006, and in Jena fully restored. On April 25, 2007, the telescope was hoisted into the observatory's 51 m high dome, on May 4, 2007, its second opening ceremony was celebrated.