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    Working Analemma
    From: Lu Abel
    Date: 2006 Nov 05, 14:21 -0800

    Today I returned from visiting my daughter, who is a student at the
    University of Puget Sound in Tacoma (just south of Seattle, for our
    international readers).   UPS just opened a big new science building
    and, as perhaps befitting a liberal arts college, its decorative
    architecture reflects a theme of "science as art"  (for example, the
    courtyard outside the building is covered with bricks in a pattern
    reflecting a famous fractal).
    
    Two items of its decoration immediately energized my celestial
    navigation neurons:
    
    A decorative medallion immediately  next to the main door shows Venus's
    epicyclic path with respect to the Earth, very much reminding me of
    medieval astronomy illustrations.
    
    But the biggie is 30-foot tall analemma on the south wall of the main
    entry.  Sunlight enters through a skylight above and is focused by a
    reflecting mirror onto the wall (hence the location of the analemma on
    the south wall).  At noon every day, the spot of light is on the correct
    location for the day of the year on the analemma.   Unfortunately, it
    was cloudy and rainy both days I was there (welcome to the Pacific
    Northwest of the US), so I never got to see it in action.
    
    Lu Abel
    
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