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Thread: Daylight hours worldwide

  1. #1 Daylight hours worldwide 
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    Hi there

    I was wondering how many daylight hours each area of earths surface recieves.

    At first consideration it seems there will be an equatorial difference. But when day lenght is considered , the quantity of surface sunshine should remain uniform.if i knew the answer ,i wouldn't ask the question.

    please ignore shading by high mountains , and the quality of light. Since artic regions recieve 6 month sunshine,and moving southwards the days lenghten accordingly, doesn't it even out globally?

    Cheers
    I look forward to the answer


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  3. #2  
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    Quote Originally Posted by iseeson View Post
    Hi there

    I was wondering how many daylight hours each area of earths surface recieves.
    Equivalent direct sun hours? Or any sun at all? And do you want to take weather into account?

    NREL has a website that shows equivalent direct daylight for places across the US (for solar power planning.)

    http://rredc.nrel.gov/solar/old_data...tlas/serve.cgi


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  4. #3 Daylight hours 
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    [QUOTE=billvon;606075]
    Quote Originally Posted by iseeson View Post
    Hi there

    I was wondering how many daylight hours each area of earths surface recieves.
    Equivalent direct sun hours? Or any sun at all? And do you want to take weather into account?

    NREL has a website that shows equivalent direct daylight for places across the US (for solar power planning


    No. It was more about the balance of radiation hitting the glodal surface if it were not deflected by upper air interference or topography.

    simply if the earth were a rubber ball and behaved as it does, is there any variation in radiation hours.

    I am assuming that equatorial regions will have roughly equal day night consistently. And the poles six months dark , six months light. Reason in my armchair seems to favour even radiation globally.

    i am aware that angular factors and other effects influence what happens when it gets here, but the base question is . "Does the sun radiate towards every part of the globe for the same number of hours each year"

    cheers
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  5. #4  
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    Quote Originally Posted by iseeson View Post
    No. It was more about the balance of radiation hitting the glodal surface if it were not deflected by upper air interference or topography.
    Oh, OK.

    Total energy hitting the Earth (above the atmosphere) - 1360 w/m^2
    Total energy hitting the surface when the sun is overhead - ~1000 w/m^2
    Total energy hitting the surface, averaged over the entire surface - ~230 w/m^2
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  6. #5 Answer achieved 
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    Quote Originally Posted by billvon View Post
    Quote Originally Posted by iseeson View Post
    No. It was more about the balance of radiation hitting the glodal surface if it were not deflected by upper air interference or topography.
    Oh, OK.

    Total energy hitting the Earth (above the atmosphere) - 1360 w/m^2
    Total energy hitting the surface when the sun is overhead - ~1000 w/m^2
    Total energy hitting the surface, averaged over the entire surface - ~230 w/m^2

    Thanks. The answer was in hours. I don't think i expressed it correctly.

    It seems the shape of the globe is important. Curiously , the equater gets 5 days less day light hours than the poles , with the artic being slightly ahead of the antartic.

    Cheers
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