Title: Herstmonceux Castle
Content: In 1957 the Herstmonceux Castle grounds became the home of the Royal Greenwich Observatory and remained so until 1988, when the observatory relocated to Cambridge. Several of the telescopes remain but the largest telescope, the 100 inch (254 cm) aperture Isaac Newton Telescope was moved to La Palma, Canary Islands in the 1970s. The estate provides housing to the Equatorial Telescope Buildings, which have been converted to an interactive science centre for schoolchildren. The empty dome for the Newton Telescope remains on this site and is a landmark, visible from afar. In 1992 Alfred Bader, an alumnus of Queen's University,

Title: Hale Telescope
Content: mirror.. It was completed in 1948 and is still in active use. The Hale Telescope represented the technological limit in building large optical telescopes for over 30 years. It was the largest telescope in the world until the Russian BTA-6 was built in 1976, and the second largest until the construction of the Keck Observatory Keck 1 in 1993. Hale supervised the building of the telescopes at the Mount Wilson Observatory with grants from the Carnegie Institution of Washington: the telescope in 1908 and the telescope in 1917. These telescopes were very successful, leading to the rapid advance in understanding

Title: Otto Struve Telescope
Content: light in 1939, behind the 100-inch Hooker telescope and ahead of two large British Commonwealth telescopes, both in Canada. Many competing projects were delayed due to the war in the early 1940s. Four largest telescopes in 1939: Otto Struve Telescope The Otto Struve Telescope was the first major telescope to be built at McDonald Observatory. Located in the Davis Mountains in West Texas, the Otto Struve Telescope was designed by Warner & Swasey Company and constructed between 1933 and 1939 by the Paterson-Leitch Company. Its mirror was the second largest in the world at the time. It was named after

Title: Berlin Observatory
Content: from Carl Zeiss in Jena. In 1924 followed the completion of a 120 cm reflecting telescope, at the time the second-largest telescope in the world and the largest in Europe. After the Second World War, the reflecting telescope was dismantled and was shipped off to the Soviet Union as reparations (a fate shared by other observing instruments) It was sent to the Crimea complete with its dome;– to reconstruct the Crimean Astrophysical Observatory, Simejis, destroyed in the war. – where it is still in service today. In 2002, the remaining torso of the building was fully restored and completed and

Title: Anglo-Australian Telescope
Content: telescopes were located in the northern hemisphere, leaving the southern skies poorly observed. It was the largest telescope in the Southern hemisphere from 1974-1976, then a close second to the Victor M. Blanco Telescope from 1976 until 1998, when the first ESO Very Large Telescope (VLT) was opened. The AAT was credited with stimulating a resurgence in British optical astronomy. It was built by the United Kingdom in partnership with Australia but has been entirely funded by Australia since 2010. Observing time is available to astronomers worldwide. The AAT was one of the last large telescopes built with an equatorial

Question: Where was the world's largest telescope until 1948?
Answer: Mount Wilson