This latter idea was, however, not adopted elsewhere, although the transit instrument soon came into universal use ( the first one at Greenwich being mounted in 1721 ), and the mural quadrant continued until the end of the century to be employed for determining declinations.
22.
From the end of 1957 until the end of 1959, three new observation pavilions were built-Pavilion of Large Vertical Circle Askania 190 / 2578 mm, Pavilion of Large Transit Instrument Askania 190 / 2578 mm and Pavilion of Large Meridian Circle Askania 190 / 2578 mm.
23.
While the transit instrument and the meridian circle were used for a star catalogue of 3000 stars that included standard stars, large proper motion stars, variable stars and the like, it is with the new 8-inch Cooke equatorial that he made discoveries of asteroids and variable stars.
24.
He was a notable amateur scientist and took his wife to Thebes to observe the Transit of Venus in 1874, taking with him a small transit instrument, a 6-inch telescope and a 12-inch telescope, recording the time of first contact, and also observed a white halo, proving an atmosphere around Venus.
25.
In October 1884, the International Meridian Conference at Washington DC adopted a proposal which stated that the prime meridian for longitude and timekeeping should be one that passes through the centre of the transit instrument at the Greenwich Meridian as the prime meridian and Greenwich Mean Time ( GMT ) as the world's time standard.
