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Frank,


Thank you very much for your quite interesting feedback and comments.


May I ask one question here regarding Lunars with "significantly phase angled 
planets" (i.e. Venus and Mercury)? Since phase angle can be fully accounted 
for in Body Coordinates Computation, what would you think of shooting such 
"Inferior Planets Lunars" through observing this Planet through carefully 
selecting one of your "opaque" glasses on your sextant (i.e. brightness 
reducing glass, sorry I do not remember the name of such glasses in English, 
and I think that you would select the one with the least efficiency if you 
have one installed), so that it would reduce the ?Planet to a "light 
pinpoint" ?

This method might also take good care of "getting rid" of additionnal 
observation inaccuracies due to the Planet semi-diameter because if you 
swing-kiss the Planet center of light instead of some Planet limb, you then 
can just ignore Planet Semi-diameter value (i.e. make it equal to Zero) in 
your computational data processing.

The reason I am asking this is simply because you have indicated more than 
once that you do not seem as confident with Planet Lunars than with Stars 
Lunars. The "slightly opaque glass" trick would aim to reducing the planet 
into a light pinpoint mostly similar to a star light pinpoint. The only 
remaing difference between Star and Planet Lunars would then essentially be 
correctly handling horizontal parallax correction for the Planet, an effect 
which on some occasions can reach 0.4' for Venus.


Thanking you for your kind Attention, I am remaining

most Sincerely Yours, and

thank you again for the Navlist site which I am truly enjoying more and more


Antoine


Antoine M. "Kermit" Couette

PS : Did you have the opportunity to cross-check the results I published and 
commented in thread "NavList 9816" (also found in "Navlist 9868")?

In NavList 9816 I did reduce Lunars in an "UNCONVENTIONAL WAY". Instead of 
reducing them to the center of the Earth (to further compare them to 
published/computed geocentric Lunar Center/Body Center distances) I choose 
here to directly compare Sextant readings (corrected only for Instrument 
error) with computed sextant readings derived from an assumed knowledge of 
the environment, whether UT, Observer's position, Lunar Sextant Distance 
corrected for instrument error, and Lunar/Body sextant heights.


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