[LEAPSECS] more on NREL SPA

[Steve Allen]

web calculator at
http://www.nrel.gov/midc/solpos/spa.html

full description at
http://www.nrel.gov/docs/fy08osti/34302.pdf

Just by itself figure A2.1 would make me very afraid because of the
offset and slope, but more relevant is the years of comparison with
the almanac: 1994, 1995, 1996, and 2004

Those first 3 years will have been calculated using the FK5
conventions that started in 1984.  The last year will have been
calculated using the IAU 2000 conventions that started in 2003.

--
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