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    Emergency sun declination
    From: Jim Thompson
    Date: 2004 May 19, 18:37 -0300

    What about this method for emergency calcuation of declination?
    
    1. Label a compass rose June 22 at 000o, Sept 23 at 090o, Dec 22 at 180o and
    March 21 at 270o.
    2. The radius on the vertical axis is the declination of the sun. A
    horizontal line from any date around the circle intersects that vertical
    radius.
    3. Measure the length of the vertical axis from the center to the
    intersection of the horizontal line, divide that length by the full radius,
    and multiply that ratio by 22.5o.
    4. Error is +/- 0.5o.
    
    Jim Thompson
    jim2{at}jimthompson.net
    www.jimthompson.net
    Outgoing mail scanned by Norton Antivirus
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