Royal Observatory (Greenwich)
The Royal Observatory is one of the fascinating buildings at Greenwich in Greater London.
It was founded in 1675, for the purpose of finding a way to determine longitude, essential for navigators when making long voyages out of sight of the land.
The building was designed by Sir Christopher Wren, famous as an astronomer before becoming an architect.
It was due to the Royal Observatory that Greenwich Mean Time was adopted. The signal is given by a Time Ball, similar to that at Deal.
The observatory contains an excellent collection of navigational instruments, including some by Harrison, as well as some astronomical instruments.