[]-ban megjelent az első Tengerészeti Almanach (''Nautical Almanac'') [[Nevil Maskelyne]] irányításával, ezzel teljesült Károly király óhaja.
A 18. és 19. század folyamán az obszervatórium többnyire pozíciós csillagászattal foglalkozott. Az égi objektumok fizikai tulajdonságainak vizsgálata a 19. század vége felé kezdődött [[William Christie]] igazgatósága alatt.
He installed a 0,71 m refractor in the famous Onion Dome, and founded the Physical Observatory, equipping it with a 0.66-m (26-in.) photographic refractor and a 0,76m reflector. To these were added the 0,91m Yapp Reflector in 1934, but by then the observing conditions in London skies were deteriorating. Plans to move away from the capital were not acted upon until 1948, when Harold Spencer JONES took up residence at Herstmonceux Castle, Sussex, at the start of a ten-year transfer from Greenwich. The institution became the ROYAL GREENWICH OBSERVATORY (RGO), and continued most of the activities previously carried out at Greenwich, including the time service. The old observatory buildings, known today as the Royal Observatory Greenwich, were developed into a museum as part of the National Maritime Museum. Its main attraction for many visitors is the Prime Meridian of the world.-->