A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David C
Date: 2016 Jun 29, 13:39 -0700
Thanks for the replies.
I had calculated Hc for both an assumed and my actual position. When I worked the time sight I mixed up the data. Using the correct data for my actual position in the time sight gave me a perfect result. The two Sumner lines now cross at my location.
I wanted to use the multi-latitude method because that was how Sumner discovered the position line.
I now know how to reduce a time sight and plot Sumner lines. If I have problems in the future it will be a numerical error on my part.
I will modify the t formula to account for same and contrary lat & dec.
I have a brand new artificial horizon sitting beside me but when I look out of the window all I can see is an overcast sky. Grrr!!! Maybe I should use my spare time to can learn Ageton's method (-;