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historicalmarkerproject/markers/HM27RI_family-tombstone-of-edmund-halley_London-England.html
The Family Tombstone of Edmond Halley (1656-1742) 2nd Astronomer Royal, 1720-42
The tombstone was moved to the Observatory from the churchyard of St Margaret's in Lee when Halley's tomb was restored by the Lord Commissioners of the Admiralty in 1…
historicalmarkerproject/markers/HM27RH_dedication-plaque-of-flamsteed-house_London-England.html
The most noble King Charles II, greatest patron of the arts of Astronomy and Navigation, had this Observatory built to serve both arts. In the year of our Lord 1676, in the twenty-eighth year of his reign. Jonas Moore, Surveyor General of the Ordn…
historicalmarkerproject/markers/HM27RG_greenwich-meridian-marker-1750-1851_London-England.html
This pillar was built in 1798 to help astronomers align the Observatory's meridian telescope in the building behind you. This telescope defined what was then the Greenwich Meridian established in 1750 and was kept accurately positioned by sighting…
historicalmarkerproject/markers/HM27RF_bradleys-meridian-line_London-England.html
James Bradley, third Astronomer Royal, observed with improved accuracy using the telescope (purchased in 1749) that first defined this line in 1750. Owing to the unequal length of solar days, astronomers measure the time using distant stars. Stars…
historicalmarkerproject/markers/HM27RE_the-greenwich-meridian-telescope_London-England.html
Behind the window is the telescope which defines the Greenwich Meridian, the transit circle of 1850 designed by 7th Astronomer Royal, George Airy. It was the centre-line of this instrument which was adopted by an international conference in Washin…
historicalmarkerproject/markers/HM27RD_yuri-gagarin_London-England.html
Yuri Gagarin (1934-68)
Statue by Anatoly Novikov
On 12 April 1961 the Russian cosmonaut, Yuri Gargarin, became the first human being to travel into space. In 2011, to mark the 50th anniversary of Gagarin's flight, the Russian Space Agency, Ros…
historicalmarkerproject/markers/HM27QX_time-for-everyone_London-England.html
The Royal Observatory is famous for supplying Greenwich Mean Time. From 1833, astronomers made a daily signal to mariners in the Thames at 1 p.m. (1300 hrs) by raising and dropping the time-ball on Flamsteed House. In 1852 electrical technology en…
historicalmarkerproject/markers/HM27QW_william-herschels-telescope_London-England.html
This is the remaining section of a 40-foot (12m) reflecting telescope, built for the astronomer William Herschel, who became famous for his discovery of the planet Uranus in 1781. the telescope was the largest in the world and cost over £4000, …
historicalmarkerproject/markers/HM27QV_the-royal-observatory_London-England.html
Welcome to the Royal Observatory, the historic home of British astronomy, Greenwich Mean Time and the Prime Meridian of the world.
King Charles II signed a Royal Warrant in June 1675 to authorize building the Royal Observatory on the foundatio…
historicalmarkerproject/markers/HM27QU_airys-meridian-line_London-England.html
George Biddell Airy, seventh Astronomer Royal, commissioned the enormous telescope that still defines the Prime Meridian and is situated in the building ahead of you. Observations made here were used by cartographers, surveyors, navigators and ast…