NavList:

Although I may not have the judgement in lunars that my esteemed colleagues on the list possess, I do believe I can lend some clarity to the discussion about what the altitudes in the log mean.

For the same lunar distance at 155 degrees 13.1 minutes, I used Frank's online calculator and a time of 15-48-12. I injected the altitudes exactly as given in the log into the LL (lower limb) fields of the calculator. Frank's calculator states that the error in the lunar is now Zero minutes! The error in longitude is a mere 1.3 minutes.

Therefore, if you know precisely what Frank means by his altitude fields, you can determine more about the data presented in the log. The solution that Frank provides states "Cleared using observed altitude".

Finally the calculator states an error of 3.8 minutes in Moon altitude and 3.4 minutes in the Sun's altitude. In attempting to use 3.6 minutes as an index correction, it is shown that the error in alitudes are in opposite directions.

Best Regards
Brad

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