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Nice catch by George!  Declination can of course be
less than one degree North or South.  The math works
for small declination; user interface doesn't.  Quick
fix:  If declination is less than one degree, enter
minutes as decimal degrees.

Revised version is attached which should fix the
problem more elegantly.

Has anyone followed the hint in the file name and
found:

James A. Van Allen, Basic principles of celestial
navigation, American Journal of Physics -- November
2004 -- Volume 72, Issue 11, pp. 1418-1424.

(Google to find online.  Yes, THAT Van Allen!)


Test data from ICE:

         Celestial Navigation Data for 2007 Mar 20 at
18 00 00 UT (GMT)
                              Delta T =  69.5 seconds 
                 For Assumed Location:  Longitude   W 
77 10.1
                                        Latitude    N 
38 53.3

                     Almanac Data                   ³ 
  Altitude Corrections
 Object       GHA        Dec         Hc       Zn    ³
Refr    SD     PA     Sum
              ø   '      ø   '      ø   '       ø   ³ 
 '      '      '      '
 SUN         88 07.3   s 0 06.0   +49 44.2   197.1  ³ 
-.9   16.1     .1   15.3
 MOON        67 52.4   n11 51.3   +61 43.8   160.5  ³ 
-.6   16.9   29.4   45.7

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