Original Spot on Sundial - San Francisco Model w/ Personalised Option
The main features of the Spot-On Sundial San Francisco Model 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.
Choosing the correct model for you location
Horizontal sundials need to have the angle between the gnomon (which casts the shadow) and the dial plate appropriate to the latitude where they are to be used. If you do not know the latitude of your location, you can find it out from the links on our latitude page.
The Spot-On Sundial San Francisco Model is suitable for use between:
|Latitude deg.||Latitudes between|
|37° 45' N||36 to 40.5° N|
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.
- 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.
The Spot-On Sundial can be personalized with an engraved message and is an ideal gift for any special occasion.
Personalized engravings cost an additional £45, are limited to 60 characters and can be spread over 3 lines.
If you require engraving please type your inscription in the Engraving box above and also state the number of lines you would like in the Comments box.
Standard dials are normally dispatched in 1-2 working days. Engraved dials are normally dispatched in 1-2 weeks. If you require engraving and your timeline is limited for engraving, some customers order the sundial and have it engraved by a local engraver.
Our Sundials are handicrafts and can be used indoors or out. Slight surface variations or blemishes are expected as it is designed for outdoor use, where the line of light will show the sun time on the dial and exposure will change the appearance over time.