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History
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James Gregory (1638–1675)
James Gregory (1638–1675)
Vera circuli et hyperbolae quadratura, 1667
Vera circuli et hyperbolae quadratura, 1667
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Stratospheric Observatory for Infrared Astronomy
Stratospheric Observatory for Infrared Astronomy
24-inch convertible Newtonian/Cassegrain reflecting telescope on display at the Franklin Institute
24-inch convertible Newtonian/Cassegrain reflecting telescope on display at the Franklin Institute
A replica of Newton's second reflecting telescope which was presented to the Royal Society in 1672.
A replica of Newton's second reflecting telescope which was presented to the Royal Society in 1672.
The great telescope of Birr Castle, the Leviathan of Parsonstown. Modern day remnants of the mirror and support structure.
The great telescope of Birr Castle, the Leviathan of Parsonstown. Modern day remnants of the mirror and support structure.