NavList:

From 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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