Solar tracking page.
LEDs as sun sensors.
Much more.
Many examaples sof actual implementations and sicussin and circuits
Very worthwhile page

http://www.redrok.com/led3xassm.htm#led3x

Annual Sunpath diagram

   http://www.redrok.com/images/sunpath.gif

Misc circuits
Solar focus (pun noticed)

   http://www.redrok.com/electron.htm

Patents list
Solar emphasis

    http://www.redrok.com/neat.htm#MPPT

Linear actuators
More solar trackers
Other

         http://www.redrok.com/actuator.htm
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