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I've come to the conclusion that the only way to get any information
on the probability of seeing a sunrise/set is to build myself a sun
detector and I would like to post my idea to get some feedback.

My idea is as follows:

1. Using a handy datalogger I intend to record the output from several
simple Photo Voltaic cells.

2. I will assume that the power of the sun is roughly constant to a PV
panel mounted perpendicular to the rays.

3. And that the power is proportional to the output current.

4. Because I can't move a PV panel to track the sun, I will instead
mount 5 panels at 90degrees to each other to form a cube.

5. I will calcualte the effective power of a PV cell perpendicular to
one panel by using the sum of the squares of the solar power on each
side is proportional to the total sunshine.

6. I will assume that current calibrated to be around "10,000" lux or
greater is "visible sun" and less than that means the sun is mainly
obscured.


My main worry is that I don't think the lux of the sun is anything
near constant, and I would like to test it out, but given the lack of
sunshine in this god forsaken bit of Scotland at the moment it could
literally be months before I could test this out using a decent lux
meter.

If anyone could tell me the lux reading of a full sun at sunset/rise I
would appreciate it and I could compare it with the 50,0000-100,000
lux I think is normal.

Mike


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