NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Working Analemma
From: Frank Reed CT
Date: 2006 Nov 5, 19:31 EST
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From: Frank Reed CT
Date: 2006 Nov 5, 19:31 EST
Lu you wrote:
"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. "
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. "
One of the lecturers at the Seaport Planetarium at Mystic Seaport back in
the late 70s painted an analemma on his living room ceiling. He had a mirror
mounted on a little base on the windowsill of a south-facing window. Once a week
at exactly noon local mean time, barring clouds, he would mark the spot on the
ceiling where the Sun's image was projected by the mirror. After a year he
filled in an arc connecting the points. Sure enough, he had that classic "figure
eight" analemma shape (although as Herbert Prinz has explained, it probably
shouldn't be called an analemma).
-FER
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
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