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The Learning Kingdom's Cool Word of the Day for July 22, 1999
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analemma [n. an-uh-LEM-uh]
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If you record the exact position of the Sun in the sky at the same
clock time every day for a year, the resulting collection of points
is called the Sun's analemma. It's a figure-8 with the northern loop
smaller than the southern loop.
The shape is the result of the tilt of the Earth's axis and the shape
of its orbit around the Sun. Because the Earth's orbit is not
perfectly circular, the analemma is a loopy shape rather than a
simple line.
To properly calibrate a sundial, one must know the Sun's analemma and
the local latitude. The word is Latin for sundial, from the Greek
analambanein (to take up), from ana- (upward) and lambanein (to take).
Also from that root is analeptic [adj., n. an-uh-LEP-tik]
(restorative or stimulating, or a stimulating medication).
More about the Sun's analemma:
http://www.analemma.com/Pages/framesPage.html
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