
 IF DOUBLE SECOND DIFFERENCE (dsd) ERROR IS GREATER THAN 1.0 MINUTE,
   AT DECLINATION ##.5 DEGREES, THEN A *# WILL BE PRINTED TO
   THE RIGHT OF d, # IS THE NUMBER OF MINUTES OF Hc ERROR AT DECLINATION
   ##.5 DEGREES.

 DSD is usually needed if Lat is within 3 deg of Dec and
   LHA is between 1 to 20 deg or 340 to 359 deg and
   Hc is greater than 60 deg.
   Minimum of 1.0 minutes error befor DSD corr is used.

 USE MENU NUMBER 4 TO INPUT d AND *# AND CALCULATE Hc CORRECTION.

 zd IS DIFFERENCE IN Z FOR DECLINATION, AND Z FOR DECLINATION + 1 DEGREE.
 zd corr IS LINEAR INTERPOLATED zd, BY DECLINATION MINUTES

 HO-249 has Lat 0 listed in only SAME name as Dec, no CONTRARY. 
 If rounded Lat = 0 then use name of Dec for name of Lat.
