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Thread: Sun Patterns

  1. #9
    Hello, I must be going... Not a Number's Avatar
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    Check out the animations on this site to see these effects.

    The apparent position of where the sun meets the horizon at sunset and sunrise will shift with the seasons too.

    A good architect will take these into account when designing a building to minimize or maximize the effects of heating from solar radiation. There are computer programs that architects use to model this.

    While tedious the math just involves Euclidean geometry. After all Erastothenes was able calculate the circumference of the earth to an astounding degree of accuracy around 250 BC. http://en.wikipedia.org/wiki/Eratost..._circumference

  2. #10
    OMG h8 pings MrFlyTrap2's Avatar
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    From the page NaN linked to...

    http://www.wsanford.com/webcam/earth...s/analemma.gif

    I think this is showing the wobble I'm curious about, and when the cross hair is in the US, that must be the time I'm thinking bout where I remember sun in the alley. I'm going to try to hunt down a weather student to find out where we're currently at. And according to my field observer, while at work today the alley was still in the shade at noon today.

    So what do you guys think? Should I try to figure this out more, or just screw it, set stuff up, and see what happens?

    Nate
    My Grow List

    "It is only by studying nature that can we ever hope to defeat it."

  3. #11
    Hello, I must be going... Not a Number's Avatar
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    The analemma (sort of a sun calendar) shows the effect clearly:

    http://www.georgefcram.com/education/gr1.jpg

    See this page for the time equations:

    http://home.netcom.com/~abraxas2/eot.htm

    They have a free sundial program for download that you can play with:

    http://home.netcom.com/~abraxas2/freesoft.htm

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