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Paul:

The problem I have with the Practice Bubble Horizon, aside from operational delicacy, holding the bubble level with the reference line while bringing the solar body to tangency with the referwence line is determining the Bubble Correction (BC), this with the PBH mentioned in the Celestaire Catalog.

It might be that I�m thick headed, but I haven't been able to grasp this. BTW, as to shooting a star with the PBH, since it is NOT illuminated, I doubt that this would work. I could of course be wrong here.

In any case, using the Davis Artificial Horizon, also shown in Celesta ire, once I bothered to read the data sheet that came with it, plus a couple of other articles, Murphy's Law is still operational, I get good results, estimated positions fall well within 5 NM of Known Position (GPS coordinates), shooting the sun in the morning and again in the afternoon, a series of shots separated by 4 to 6 hours. Fairly often, my estimated position is within 2 NM of KP, when I escape reading the wrong line in Nautical Almanac Daily Pages, avoid transposition of numbers and miscellaneous arithmetic errors. Trig, courtesy of my old HP 11C is easy, provided I make no mistakes keying in numbers. Problems and decisions, wherever one looks.

I think they wrote a song that describes the thing well enough, some of the words were as follows. �The game of life is hard to play, you�re going to loose it anyway�. Playing the game can be interesting though, provided one does not take oneself to seriously.

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