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    Will the sun shine?
    From: Mike L
    Date: 2007 Nov 27, 07:28 -0800

    As I sit here in the cold grey of a Scottish winter and remember
    seeing the sun for a total of one minute during the last three days,
    I'm wondering how practical a session of "solar navigation" would be
    and whether there is any way to find out how often the sun shines?
    
    I once spoke to the met office but they couldn't (or wouldn't) tell
    me. I've looked at solaration tables for solar panels, but couldn't
    separate out the "background - cloud" light level from the "sunshine"
    hours.
    
    So, perhaps someone here know?
    
    In particular I have the following specific questions (ideally for
    locations of Glasgow and London, summer/winter but any information, on
    any location, anytime would be better than none!):
    
    1. Assuming a view of the horizon, how often can one see the sun at
    the moment of sunrise/sunset.
    2. How often can one see the sun at the meridian?
    3. Howmany hours of navigable sunshine do we get?
    
    Mike
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