NavList:

That's a good idea. Another way to do the computation is to just compute data for every twenty minutes and then plot a graph of the points. The graph allows you to pick off data for intermediate times. To make determining the intercept even quicker you can apply the sextant corrections with the sign reversed to the Hc to determine precomputed altitude, Hp to put in your table or on a graph.. Then you can compare the raw sextant altitude to Hp and determine the intercept. I am attaching some reference works on this subject.

In flight navigation you plan the time of the sights and take them on time like you did. When I was taking a lot of sights to determine the accuracy of an artificial horizon I tuned my radio to WWV and took the sights on the minute beep, works real well for a series of sights. It is easy to take a sight a minute, sixty in an hour.

http://www.fer3.com/arc/imgx/NIF-Landfall.pdf

gl

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