Forum Moderators: open
I have a feeling that someone will get this right away...just a hunch.
[hpd-online.com...]
The Model 126 Heliodon is built to demonstrate the motion of the sun relative to a building for the purpose of designing solar responsive architecture.A well designed building will harvest the winter sun, reject the summer sun and collect daylight all year. The HPD Model 126 Heliodon makes it easy for anyone to learn the principles required for achieving solar access and shading. Within only minutes of use, the heliodon evokes an "aha" response from both children and adults. The HPD Model 126 Heliodon can be used as a demonstration device, as an interactive hands-on teaching tool, and as an architectural design tool for testing and comparing alternative designs.