created by Carl Sabanski
Gnomon-less Equatorial Sundial Kit
Equatorial Sundial: a dial in which the dial plate is parallel to the equatorial plane and the polar-pointing gnomon is perpendicular to it.
The gnomon-less equatorial sundial is a universal sundial and can be used anywhere in the world. All you have to do is position it correctly and it will tell you the time.
The gnomon-less equatorial sundial is a modified equatorial ring sundial. The equatorial ring sundial has a gnomon, which is usually a narrow rod, that casts a shadow on a narrow band displaying the hour lines. The gnomon-less equatorial sundial does not have a gnomon. Instead the two edges of the dial plate act as the styles, one for the morning and the other for the hours. These edges cast a shadow on a rather wide band containing the hour lines The time is read from this band throughout the year. A wide band is required in order to display the time telling shadow for the entire year. If the band is too narrow the shadow will move off the dial plate.
Figure 1: Gnomon-less Equatorial Sundial Kit (CAD)
This sundial kit
is a bit of a challenge to put together but you will have fun. We
have made up two kits so that you can build a gnomon-less equatorial sundial for the Northern or Southern Hemisphere. All you need are scissors,
cardboard, glue and tape. If you would like to download a
PDF file of the "Gnomon-less Equatorial Sundial Kit" just open the door that
works for you.
When you have completed the sundial all you have to do is set up and it will tell you solar time. The compass directions on the sundial pretty much tell you how it has to be placed.
Here's what the sundial will look like once you have finished making it.