The main features of the Spot-On Sundial are the modern design, the scientific accuracy engineered to provide accurate sun time given the latitude where the dial is installed, and the divided gnomon* constructed of two parallel plates with a small air gap. This permits a ray of sunshine to pass through for a few minutes at solar noon. This makes it easy to set up from a table supplied with the sundial. It also gives an "event" (like the noon cannon without the cannon!) each day.
The Spot-On Sundial London Model is suitable for use between:
Latitude Degree: 51° 30'N
Latitudes Between: N 49.75 to 53.25°
The Spot-On Sundial can be used indoors or out.
The rotating dial plate allows the use of the dial on an indoor window-sill; the base plate is pushed against the window frame, and the dial plate rotated so the sun shines through the slit on the centre line at solar noon. The centre screw is then screwed down to hold it in position.
For use outdoors, a level plinth is established, the base plate is screwed down to the plinth, the rotating dial plate set on the base plate, aligned exactly at the next convenient solar noon, and the screw tightened to hold it in position, as described in our setup page.
The design is copyright © Piers Nicholson, 2019. Each dial is unique and engraved with its own serial number on the side of the baseplate.
Original Spot on Sundial (London Model)
- Solid brass construction
- Easy to set up
- "Line of light" at every noontime
- Concealed fixings
- Marked in Roman numerals for winter time, and Arabic for summer time
- 17 cm. square, 12 cm. overall height, weight 4.3 lb.
- Designed for use indoors or outdoors
- Complete set-up instructions
- Can be read to an accuracy of two minutes or less
- Every sundial individually numbered.