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Brad:

 

I'm beginning to wonder if any purpose will be served by your planned "Shootout"? The method that Frank proposes is fundamentally the same as mine. The differences are in the details. He works a bit to avoid the Nautical Almanac, and I use it, and he adjusts every altitude while I make one correction at the end. So, it seems to come down to how accurate our plotting is.

 

And George has reduced the problem to just that. I would prefer to work from real data, but his method of faking it sounds credible. I have to struggle a bit to find almanac data that is almost like his simplified case. I can't find a date in 2008 around noon when the declination is S23°24.0', and the equation of time and d are both zero, but December 24 is close. I can then surmise that the fictitious 1200 UT GHA is zero. And that tosses the almanac, so the difference in method is reduced to plotting accuracy.

 

Jim Wilson