The exterior of the Royal Observatory with the time ball on the north eastern turret of the Octagon Room. The time ball was placed here in 1833 and drops at exactly 1300 hours to signal the correct time to ships on the nearby River Thames.
- Date:
- 1945 - 1965
- Location:
- Royal Observatory, Greenwich Park, Greenwich, Greater London Authority, SE10
- Reference:
- AA001119
- Type:
- Photograph (Negative)