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His is tracking the sun not the stars though, be lucky to get the sun to travel that many time across the sky in 6 hours;)
That is some impressive star work though.
Thought a few on here might find this quite interesting. Pinhole photography of a 6 month exposure of sites in Bristol from Winter solstice 2007 to summer solstice 2008.
How it was done...
http://www.pinholephotography.org/Solargraph%20instructions.htm
and the images created...