Royal Observatory Wall and Clock to Right of Entrance Gates is a Grade I listed building in the Greenwich local planning authority area, England. First listed on 8 June 1973. Wall, clock.

Royal Observatory Wall and Clock to Right of Entrance Gates

WRENN ID
cold-rafter-honey
Grade
I
Local Planning Authority
Greenwich
Constituency
Greenwich and Woolwich MP: Matthew Pennycook (Lab)
Country
England
Date first listed
8 June 1973
Type
Wall, clock
Address
Royal Observatory Wall and Clock to Right of Entrance Gates, Greenwich Park Se10
OS grid reference
TQ 388 773
Coordinates
51.47797, -0.00144
Source
Historic England listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Royal Observatory wall and clock, located to the right of the entrance gates in Greenwich Park, is a historic structure made of stock brick. It features a short section of wall that is flanked by two square brick piers, which are topped with stone coping. Beneath a gauged brick arch, there is a sunk panel that houses a 24-hour astronomical clock.

Local climate

Royal Observatory Wall and Clock to Right of Entrance Gates sits in one of the driest parts of the UK, with an average of 690 mm of rain a year. This makes it drier than 96% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 99% of listed buildings.

It experiences an average of 34 freeze-thaw cycles a year, more than 52% of listed buildings. Of these, 15 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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  • Detailed attributes — period, style, materials, features
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  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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Nearby listed buildings

  1. Royal Observatory, The Transit House Grade I 18 m
  2. Royal Observatory Flamsteed House Grade I 38 m
  3. Statue of General Wolfe, to East of Royal Observatory Grade II 47 m
  4. Altazimuth Pavilion at the Royal Observatory Grade II 81 m
  5. Royal Observatory South Building Grade II 142 m
  6. The Standard Reservoir Conduit House, Greenwich Park Grade II* 269 m
  7. Hillside Grade II 313 m
  8. Park Hall Grade II 314 m
  9. The White House and Garden Walls to East, South and West Grade II 332 m
  10. Boundary Wall Surrounding the Park Grade II 349 m