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Alex you asked:
"In your lunars reducing  calculator, which limb of Jupiter is counted, or
center?"

Center. That's  what's recommended in some of the old navigation manuals, and
that's how I do  it. I try to place the center of Jupiter's disk right on the
Moon's limb. (nice  couple of days for Moon-Jupiter sights in the Midwest,
huh?)

And:
"BTW, I cannot find any reference to the size of its disc  in the almanac,
but my impression is that it is very  non-negligible."

Right now it's about three-quarters of a minute of arc.  Yes, it's big. The
first month I was on this list (Dec '03), I started a thread  with a title of
something like "Jupiter is Big" discussing lunars with the  largest planet. I
find I get exceptionally good results with Jupiter, and I  think it has a lot
to do with that sharp little disk we see through the  sextant's telescope.

-FER
http://www.HistoricalAtlas.com/lunars

   

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