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    Sun position and shadow animation
    From: Frank Reed
    Date: 2013 May 16, 16:01 -0700

    Here's a really neat little animation of the Sun's position in the sky and the shadow it casts during the day:
    http://astro.unl.edu/naap/motion3/
    Click on "Paths of the Sun Simulator". This is an Adobe Flash animation, so you won't be able to view it on many handheld devices, especially iPhones and iPads. If you do get it running, click "Start Animation" in the middle, and you can watch the Sun do its thing crossing the sky at any latitude and season. Also it shows the shadow cast by a "gnomon" (the observer's head in this case). You can watch the changing hyperbolic paths of the shadow during the year. The celestial sphere can be rotated around by clicking and dragging. It's a fun toy.

    Thanks to Russell Sampson for pointing this out. He is a professor of physical sciences at Eastern Connecticut State University and was a recent participant in my "Celestial Navigation: 19th Century Methods" class at Mystic Seaport. He has a long-term project to determine the conditions under which Jupiter and other bright stars and planets can be seen in daylight which may also be of interest to some NavList folk. He and Jeremy and I spent an entertaining fifteen minutes in the late afternoon a couple of weeks ago trying to spot Jupiter with sextants. No luck!

    -FER


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