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    Re: Working Analemma
    From: Bill Noyce
    Date: 2006 Nov 12, 10:49 -0500

    On 11/11/06, James R. Van Zandt  wrote:
    >
    >
    >
    > Lu Abel  wrote:
    >
    > >   The UPS "analemma" is a stainless steel path about 2 inches wide,
    > >   inscribed at about 10 day intervals.  It was constructed based on a
    > >   set of plans provided by a professor who had to very carefully
    > >   calculate the distortions induced by the location of the mirror.
    > >   Although it hasn't been in service for a full year, I hear it's
    > >   doing fine so far....
    >
    > I assume that it works at solar noon each day.  I wouldn't be
    > surprised if they need to post a conversion table between solar time
    > and what the clocks are set to.
    
    No, that's what the "width" of the figure-8 analemma is for.  It corrects for
    the equation of time.  Of course, daylight-savings time is a different problem.
    
    >
    > Which reminds me - do you remember the analemma that Tom Hanks'
    > character drew in the cave in Castaway?  He used it as a calendar.
    > Except that he could only have created or used it if he had accurate
    > time.
    
    Yeah, what a shame.  It was such a beautiful idea.
        -- Bill
    
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