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Kermit,

> If we assume that in this published Cook's
> Lunar the MOST RELIABLE DATA as
> they can be estimated to-day are the following :
>
> 1 - the Observer's Position : "Ohamaneno Harbourg in Ulietea", as depicted
> on the "historical" charts (which you now have at hand) and which is
> nowadays very easily recognizable on Google Earth, hence the following
> Coordinates : S 16°45'33" W151°29'48", and
>
> 2 - the Sextant Distance : Sun to Moon limb to limb distance of
> 105°47'04" , (as a result of 10 averaged observations), and
>
> 3 - the following environmental constraints : Temperature : 77.5°F,
> Height of Eye : 15.5 ft , and Sea Level Pressure being set (by default) to
> 29.92 Inches of Mercury, WHILE DISCARDING THE SUN AND MOON HEIGHTS, and
>
> 4 - A date close to Sep 07th, 1773,

My main suggestion was: DO NOT ASSUME 2.
Insted ASSUME Sun's alt and COMPUTE the GMT for this position.
Second, compute Moon alt for this time and this position.
If it matches, I am right and there is an error in the Lunar.

If it does not, I am wrong, and we have to look for other explanations.

I can do this myself, when I have some free time.

Alex.

   

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