Choosing the correct sundial
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 here. The Original Spot-on Sundial is made in seven models, and the large Spot-on Sundials come in the London latitude.
| Model | Latitude degree | Suitable for use between latitudes: |
| A: Newcastle on Tyne | 55° N | 53.25 to 58° N |
| B: London | 51° 30' N | 49.75 to 53.25° N |
| C: Vienna | 48° N | 45.5 to 49.75°N |
| D: Milwaukee | 43° N | 40.5 to 45.5° N |
| E: San Francisco | 37° 45' N | 36 to 40.5° N |
| F: Los Angeles | 34° N | 32 to 36° N |
| G: New Orleans | 30° N | 26 to 32° N |
If you prefer a map of North America or Europe, see below.
