SUNDAR videos

I took the time to create a YouTube video on the SUNDAR. This gives an overview of the system:

http://www.youtube.com/watch?v=DYgdluVEM1c

And this is some more detail on the sensor head:

http://youtu.be/ipH3iqc-TdQ
I also found that I could get much better accuracy if I narrowed the slit even more. It is now the width of a playing card. As such, the sun is only visible to the sensor for a very few motor microsteps. I collected data over an hour and found that the standard deviation in heading error was under 1/2 degree. I think I can live with that!

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