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The  Royal Observatory, Greenwich  ( ROG ; known as the  Old Royal Observatory  from 1957 to 1998, when the working  Royal Greenwich Observatory RGO , temporarily moved south from Greenwich to  Herstmonceux ) is an  observatory  situated on a hill in  Greenwich Park  in south east London, overlooking the  River Thames  to the north. It played a major role in the history of  astronomy  and  navigation and, because the  Prime Meridian  passes through it, it gave its name to  Greenwich Mean Time , the precursor to today's  Coordinated Universal Time  (UTC). The ROG has the  IAU  observatory code of 000, the first in the list. ROG, the  National Maritime Museum , the  Queen's House  and the  clipper ship   Cutty Sark  are collectively designated  Royal Museums Greenwich .

The observatory was commissioned in 1675 by  King Charles II , with the foundation stone being laid on August 10. The old hilltop site of  Greenwich Castle  was chosen by  Sir Christopher Wren , a former  Savilian Professor of Astronomy ; as  Greenwich Park  was a royal estate, no new land needed to be bought. At that time the king also created the position of  Astronomer Royal , to serve as the director of the observatory and to "apply himself with the most exact care and diligence to the rectifying of the tables of the motions of the heavens, and the places of the fixed stars, so as to find out the so much desired longitude of places for the perfecting of the art of navigation." He appointed  John Flamsteed  as the first Astronomer Royal. The building was completed in the summer of 1676. The building was often called "Flamsteed House," in reference to its first occupant.

The scientific work of the observatory was relocated elsewhere in stages in the first half of the 20th century and the Greenwich site is now maintained almost exclusively as a museum, although the  AMAT telescope  became operational for astronomical research in 2018. - more at Wikipedia .

Visitor Information: https://www.rmg.co.uk/royal-observatory
(NOTE: Also take in the Queens House, the National Maritime Museum and the Cutty Sark on a visit to Greenwich).

Images:

Royal Observatory, Greenwich.

The building housing the origin of the  Greenwich Prime Meridian which is marked by a brass strip set in the ground.

#iwasthere People inevitably pose for a photo astride the brass Meridian line! On my first visit, I did, too.
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