NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2013 Jun 11, 14:54 -0400
It could also be the nominal time sight procedure. Longitude in the AM & PM, latitude at noon. I note that the noon and longitude phrases are not tightly coupled.
Please do post the article and an example of the log Peter.
Brad
Hi, Peter Cope. Welcome aboard.Longitude by Noon Sight has often been a topic here. I even did a book on it. It sounds like you have the paper which derives the formula to compensate for the effect of vessel motion. Although I have heard of this article, I have never seen it. Would it be possible for you to send a copy of the article or the "workings" and their inputs?Hewitt Schlereth
Sent from my iPadFrom Peter Cope.
I am investigating some positions recorded by a French naval vessel in 1843. I have some pages of navigational workings. These appear to be of a series of sights of the Sun to derive the longitude, on the lines of the 'Longitude Method' illustrated in a copy I have of the Admiralty Nav. Manual Vol. II 1938 ( Pages 144 and 145 ). There is no proforma or explanation of the inputs for these workings and as my astro experience was limited to the use of the Sea and Air Tables I would be grateful if any member could explain how these calculations were processed. I am hoping to be able to evaluate the accuracy of these observations. The calculations for latitude were evidently from a noon sight, and noted on the same page of workings.
If any member can assist, I will scan a specimen of the workings and the Nav. Manual pages.
Many thanks.
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