The University of London Observatory at Mill Hill in London is a teaching observatory attached to the Department of Physics and Astronomy at University College London. Mill Hill is an area in the London Borough of Barnet. ... The clock tower of the Palace of Westminster, which contains Big Ben London is the capital city of the United Kingdom and of England. ... University College London, commonly known as UCL, is one of the colleges that make up the University of London. ...

The Observatory was opened on 8 October 1929 by the Astronomer Royal Frank Dyson to house the 24-inch reflector from Dr W.E. Wilson's observatory at Daramona, Ireland which was donated to the University of London after his death. October 8 is the 281st day of the year (282nd in leap years). ... 1929 was a common year starting on Tuesday (link will take you to calendar). ... Astronomer Royal is a senior post in the Royal Household of the Sovereign of the United Kingdom. ... Sir Frank Watson Dyson (January 8, 1868 – May 25, 1939) was an English astronomer. ... Senate House, designed by Charles Holden home to the universitys central administration offices and its library The University of London is a federation of colleges which together constitute one of the worlds largest universities. ...

An 8-inch refractor was installed in 1931 following it's donation to the university by H.R. Fry of Barnett the previous year. In July 1938 the Observatory was expanded to accommodate the 24-inch/18-inch twin refractor that had been removed from the Radcliffe Observatory at Oxford in 1934. 1938 was a common year starting on Saturday (link will take you to calendar). ...

In 1951 UCL took over management of the Observatory from the University of London and several expansions over the next ten years added library, lecture, and laboratory space. University College London, commonly known as UCL, is one of the colleges that make up the University of London. ... Senate House, designed by Charles Holden home to the universitys central administration offices and its library The University of London is a federation of colleges which together constitute one of the worlds largest universities. ...

The Wilson telescope was retired in 1974 to the Merseyside Museums, and replaced the following year with a new 24-inch Ritchey-Chrétien Cassegrain reflector which was named after the former director of the Observatory, Professor C.W. Allen. The Ritchey-Chrétien telescope or RCT is a specialized Cassegrain telescope with a hyperbolic primary and secondary mirror. ...

In addition to the these three, the observatory currently also houses four modern telescopes -- a Celestron 14 inch Schmidt-Cassegrain, a Meade 7 inch Maksutov-Cassegrain, and two Meade 10 inch Schmidt-Cassegrains. Schmidt-Cassegrain The Schmidt-Cassegrain, invented by Bernhard Schmidt, is similar to the Cassegrain. ... Invented by the Russian optician Dmitri Maksutov (1896-1964), the Maksutov reflecting telescope is a type of Cassegrain telescope that uses a spherical primary mirror in conjunction with a meniscus-shaped corrector plate at the entrance pupil in order to correct for spherical aberration. ... Schmidt-Cassegrain The Schmidt-Cassegrain, invented by Bernhard Schmidt, is similar to the Cassegrain. ...

References

• University of London Observatory
• William Edward Wilson and the Story of Daramona