Solargraph pinhole photos (real)

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

Mark,

Thanks for that -- I can't wait to either try it myself or suggest it to a class. Similar, but rather more immediate, is the CD spectrometer:

http://www.cs.cmu.edu/~zhuxj/astro/html/spectrometer.html

For me, these tactile experiments are a compliment to the lessons I give on lighting simulation (so, not entirely OT then).

-John

ยทยทยท

-----------------------------------------------
Dr. John Mardaljevic
Senior Research Fellow
Institute of Energy and Sustainable Development
De Montfort University
The Gateway
Leicester
LE1 9BH, UK
+44 (0) 116 257 7972
+44 (0) 116 257 7981 (fax)

[email protected]
http://www.iesd.dmu.ac.uk/~jm