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Azimuth of the Sun, Continued
OPNAV 3130/
ACTION
Completed Strip
Azimuth by 229
Form
Date:
Enter the date.
19 NOV 84
DR Posit
Enter the DR position.
33°37'N - 112°39'E
Body
Enter the name of the body observed.
Sun
GMT
Enter the time GMT.
07h42m22s
GHA(h)
Enter the GHA hour value from the
288°
38.9'
Nautical Almanac (fig. 9-1)
Increment (m/s)
Enter the minutes and seconds value from
10° 35.5'
the Nautical Almanac (fig. 9-2).
Total GHA
Add GHA(h) and increments (m/s).
299°
14.4'
DR Long +E, -W
Enter the DR Longitude, add east or
112° 39.0'E
(+ - 360° if needed)
subtract west.
LHA
LHA= Total GHA +E or -W DR Long.
51°
53.4'
Tab Dec
Enter the tabulated declination for 07 hours
S 19° 31.2'
on the Sun column from the Nautical
Alamanac.
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#.
True Dec
DR Lat
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.
9-4
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