NavList:

Dear George,

in further reference to your post in [NavList#13881] to which I replied in post [NavList#13882] :

1 - I have just completed running my further additionnal "fictitious" Moon-Venus examples with quite similar configurations dates than in my previous post. These new dates are 21JUL1991 and 24JUL1999 which all show the same results as in my previous example for 26JULY2007 :

- The Moon-Antares Lunars show -- Error in Lunar 0'0 -- when processed through Frank's Computer, and

- The Venus position used by Frank seems very close to "POINT M" as previously defined in post [NavList#13882].

2 - In my previous post I wrote "The choice of "POINT P" by preference to "POINT M" also seems to be FULLY SUPPORTED by the Nautical Almanac."

However my example for a 0'5 correction is valid for BOTH PHASE AND PARRALLAX (and NOT for only the Phase effect), as I just (re)discovered through carefully reading the NA which might make my statement here-above a bit less valid because there are cases where the PARALLAX itself would account for a significant part of this 0'5 correction...

3 - We are then back to our initial query : how should we best compute the Offset between Center of Light (of visible Planet) and center of actual Planet itself ?

Anything in Bowditch on this topic ?

Thank you again for your Kind Attention and thanks to who-ever will bring info and definite light here.

Best Regards to all !

Kermit

Antoine M. "Kermit" Couëtte
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