HOW to Reduce a Sunline Using Pub 229, Continued
Pub 229 Naut Alm
Dec Inc /d
Dec Inc = True Dec min. only / d = d from
17.6 / +38.1
Pub 229 entered with whole degrees of
LHA, Dec, and Lat. (See fig. 9-10.)
Tens / DSD
Enter from the Pub 229 interpolation tables
located on the inside of the front and back
cover. (See fig. 9-11.)
Units / DSD corr
Same as above.
Total of tens and units.
Enter from Pub 229.
Apply Total Corr to Hc (Tab).
Drop Ho down from the top of the form.
Subtract the higher value of either
Hc(Comp) or Ho from the other. In this
case, Ho is subtracted from Hc(Comp).
The A means away. We will fully explain
Towards and Away when we plot the LOP.
Enter from Pub 229. Apply the rules for 2
just as with our azimuth problem.
LHA is greater than 180 so Zn = Z.
We have now completed the sight reduction solution for a sunline. The goal
was to obtain an LOP. Where is the LOP you ask? Everything we need is
right here. We will use the Zn (true bearing), a (intercept), and assumed
position to plot our LOP. Lets move on to that task right now.