A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert Bernecky
Date: 2017 Dec 5, 11:19 -0800
With Pub 229, your assumed position must be an full integer. As an example, say you are in Rutland, VT at N 43º 37.3', W 72º 59.3'
and (for example) assume the GHA of the body at the time of the sight is 74º 10.0'
LHA is GHA+ Assumed Longitude (treat West longitude as negative). However, we must pick a longitude so that LHA is an integer. To get an integer we pick a longitude that is near our position: W 73º 10.0' so that we get
LHA = 74º 10º - 73º 10.0' = 1º
and for assumed latitude, we would use N 44º (closest integer to N 43º 37.3').
your A.P. would be N 43, W 73º 10.0' from which you plot a Zn, and mark off the intercept.
If you post all the info, we can double check your work.