Hi Richard Looks very much like what architects would refer to as a sun-path diagram ;=) This one is an Equidistant chart of the sky vault on a 2D surface. The Equidistant sun-path is commonly used by architects in the USA, in many other parts of the globe we would use a chart which is a Sterographic (or radial) projection of the sky vault.
You can use it as follows: Assume you wish to check the possibility of the sun entering a room at a certain time of the year. Make a transparency of the Sundicator and place it over a plan of the room with its center at the point of interest. Align true north on the plan with N on the Sundicator. Draw lines from the window opening back to the point of interest. You now have a good indication of when the sun will strike the point of interest in terms of hours per day and months of the year, read from the blue scale. You would now use the red scale to make a check on the sun altitude against a section through the room in question. This way you could arrange a shading projection to cut the sun off in say the hotter months of the year. Hope this helps. -- John D Hall School of Architecture - University of Tasmania Launceston TAS 7250 - AUSTRALIA Tel (+61) 0363 24 3502 Latitude 41d 26m 1s South Fax (+61) 0363 24 3557 Longitude 147d 7m 49.5s East ---------- >From: "Richard M. Koolish" <[EMAIL PROTECTED]> >To: sundial@rrz.uni-koeln.de >Subject: picture of sun tracking device >Date: Thu, 6 May 1999 6:36 AM > > I've put a picture of what I think is a sun tracking device on my web page at > linux.bbn.com/~koolish. If anybody has seen one or knows how it was used, let > me know. There are no markings on it. >
