[Radiance-general] Solargraph pinhole photos (real)

[Mark Stock]

For all you fans of daylighting, and annual solar data junkies 
(like me), I offer you:

http://forum.skyscraperpage.com/showthread.php?t=163623

"Explanation: If every picture tells a story, this one might make 
a novel. The six month long exposure compresses the time from 
December 17, 2007 to June 21, 2008 into a single point of view. 
Dubbed a solargraph, the remarkable image was recorded with a 
simple pinhole camera made from a drink can lined with a piece of 
photographic paper. The Clifton Suspension Bridge over the Avon 
River Gorge in Bristol, UK emerges from the foreground, but 
rising and setting each day the Sun arcs overhead, tracing a 
glowing path through the sky. Cloud cover causes dark gaps in the 
daily Sun trails. In December, the Sun trails begin lower down 
and are short, corresponding to a time near the northern 
hemisphere's winter solstice date. They grow longer and climb 
higher in the sky as the June 21st summer solstice approaches.

Photo by Justin Quinnell."

And here are some more:

http://www.solargraphy.com/

Mark