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Very nice. I hope these aliens gave you a rubber dinghy so you can paddle
to Pearl Harbour :-)

To save reverse engineering the spread sheet, what were the analytical methods?

Geoffrey Kolbe

At 01:29 17/06/2008, you wrote:
>You really know quite a lot.  If it's 0600GMT (approx their morning
>twilight) and it's your evening twilight, you must be approx 12 hours
>different, or the other side of the world.  Plot the Ground Points of the
>three stars as on the attached.  For latitudes up to the give 30 deg N,
>the distortions aren't outrageous.  Draw the Zenith Distance Circles of
>Position.  Spica is about the right length since it's North-South.  Since
>Vega-Pollux intersect somewhere not too far from north of Spica and are
>mostly East-West, scale the lenghts on this plot by 1/cos(Lat).  So AP
>could be somewhere near 25N, 157W.
>
>But no AP is needed it you're willing to do some math.  The attached
>spread sheet shows two analytic methods (which, luckily give the same
>answers).  It can be seen, the 3 intersection points are:  23-18.4N
>157-17.5W, 23-18.4N 157-17.5W, and 23-18.3N 157-17.6W
>
>
>>
>


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