Abstract

The projection of the sun on and into buildings is normally analysed with the use of a model and heliodon or sundial.
This involves making a model and, in order to obtain an accurate record, taking photographs. This process is both
time consuming and, since models are not readily altered, tends to be employed at the later stages of design when built
form is finalised.
The method proposed here is quick to use and, being graphical, allows for easier experimentation with built form at an
earlier stage in design. It will also aid in decisions concerning solar shading by canopies, overshadowing by obstructions,
the duration of sunshine on a surface, shadow projection and the penetration of sunshine into rooms.