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How to Reduce a Sunline Using Pub 229, Continued
OPNAV 3130/30
ACTION
Completed Strip
Pub 229 Naut Alm
Form
Ho
Apply altitude corrections to find.
25°
53.3'
GHA(h)
Enter the GHA hour value from the
313°
57.7'
Nautical Almanac.
Increment (m/s)
Enter the minutes and seconds value from
3°
54.5'
the Nautical Almanac.
Total GHA
Add GHA(h) and Increments (m/s).
317°
52.2'
v/v corr
ENTER SHA for stars or planets only.
STARS and PLANETS
SHA
ONLY
a Long (+E, -W)
Enter the assumed DR longitude to arrive at
17° 52.2'W
(+ - 360° if needed)
an even degree of LHA, add east and
subtract west.
LHA
LHA= Total GHA + (v/v or SHA for star
300°
00.0'
and planets) +E or -W DR Long.
Tab Dee
Enter the tabulated declination for 07 hours
N 4° 17.3'
on the Sun column from Nautical Almanac.
d# / D Corrn
The d# is found at the bottom of the Sun
+0.6 / +0.3'
Dee column; in this case it is +1.0. It is
assigned a + because dec is increasing.
True Dec
DR Lat
same or contrary
The D corr is found on the Increments and
Corrections page for 15m38s. Look under
the v or d column for the d# (1.0) 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 Dee is N, so
it is same.
N 4° 17.6'
N 37° same
We have finished stages 2 and 3 and can move on to our final stage.
9-25
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