Azimuth of the Sun, Continued
Azimuth by 229
Enter the date.
19 NOV 84
Enter the DR position.
33°37'N - 112°39'E
Enter the name of the body observed.
Enter the time GMT.
Enter the GHA hour value from the
Nautical Almanac (fig. 9-1)
Enter the minutes and seconds value from
the Nautical Almanac (fig. 9-2).
Add GHA(h) and increments (m/s).
DR Long +E, -W
Enter the DR Longitude, add east or
(+ - 360° if needed)
LHA= Total GHA +E or -W DR Long.
Enter the tabulated declination for 07 hours
S 19° 31.2'
on the Sun column from the Nautical
d# / D Corrn
The d# is found at the bottom of the Sun
+0.6 / +0.4
Dec column, in this case it is +0.6. It is
assigned a + because Dec is increasing
(0700= 19°31.2 0800= 19°31.8). You
MUST assign a + or - to the d#.
same or contrary
The D corr is found on the Increments and
Corrections page for 42m 22s. Look under
the v or d column for the d# (0.6) and
record the Corrn value (0.4). The D Corrn
assumes the same sign as the d# .
Apply the D Corrn to Tab Dec
Enter the whole degree of latitude and
determine if it is named (N or S) as True
Dec In this case, Lat. is N and Dec is S.
so it is contrary.
S 19° 31.6
N 33° contrary
Up to this point, we have worked the strip form to obtain three values, LHA,
True Dec., and DR Latitude. We now have everything we need to enter Pub
229. Pub 229 is entered using whole degrees of Lat., LHA, and Dec. only. We
will also interpolate the leftover values using Pub 229.