Choosing a Sundial type

Several factors should be considered when selecting a type of Sundial for a particular location.

First, pre-existing walls or other structures may provide a support for the sundial and save the effort of building an expensive structure. In many cases, however, it may be preferable to build from scratch if existing structures lack the size, alignment, or height to accommodate the desired sundial.

Second, the designer must also consider the visual impact of a sundial, especially in public places where a vertical wall can block a scenic view or compromise the architectural harmony of the site. In these cases, a horizontal planar sundial may be a better choice.

Finally, the mechanics and ease of use of the sundial should also be considered. The design should be easily read for the hourly time interval that is desired during the day. The clock size must be scaled so that it can be read at an appropriate distance. The design may even require the observer to play an active role in casting the shadow on the clock.

All these factors should be considered when selecting a sundial for a given site.