The Mond Dome at the Lockyer Observatory is a Grade II listed building in the East Devon local planning authority area, England. First listed on 6 July 1984. Observatory dome.
The Mond Dome at the Lockyer Observatory
- WRENN ID
- floating-frieze-gorse
- Grade
- II
- Local Planning Authority
- East Devon
- Constituency
- Honiton and Sidmouth MP: Richard Foord (LD)
- Country
- England
- Date first listed
- 6 July 1984
- Type
- Observatory dome
- Address
- The Mond Dome at the Lockyer Observatory, Salcombe Hill, Sidmouth, EX10 0NY
- OS grid reference
- SY 139 882
- Coordinates
- 50.68774, -3.21974
- Source
- Historic England listing
Description
The Mond dome at the Lockyer Observatory is an observatory dome built around 1932. It is made of reinforced concrete, cast in situ, and features a wide, fluted external plinth. The dome itself is made of aluminium and has narrow windows with concrete surrounds and cornices. There is an entrance extension that includes an ashlar surround to the doorway, along with a dedication inscription located below the cornice. The entrance has a metal door decorated with a circular astrological and lunar motif. This dome was donated by Sir Robert Mond to house a Zeiss anastigmat camera, which is used for research on the photographic survey of galactic clusters.
Local climate
The Mond Dome at the Lockyer Observatory receives an average of 780 mm of rain a year. This makes it drier than 61% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 73% of listed buildings.
It experiences an average of 19 freeze-thaw cycles a year, fewer than 80% of listed buildings. Of these, 6 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.
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