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    Automated Sun detector
    From: Mike L
    Date: 2007 Dec 6, 04:45 -0800

    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
    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
    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.
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