NavList:

Thanks George and Peter for the education. My little plane geometry demonstration didn't use real sights or spherical triangles, and I didn't suspect a navigation triangle that stretched halfway around the world would still work!

I had a look at a sun sight from a book and soon saw that George's trial, as I understand it, couldn't be done in Pub. 249 tables using that sight because large negative calculated altitudes are not listed, so I guess this would be done using a calculator, which I'll work on out of curiosity. If this comes out as I expect, the first intercept will place the LOP nearly as far back as DR was displaced, 180 degrees.

Thanks again,
Richard

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