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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Antoine Couëtte
Date: 2013 Jun 13, 02:47 -0700
re / http://fer3.com/arc/m2.aspx/Oblateness-formulas-Andr%C3%A9sRuiz-jun-2013-g24325
Hello Andrés,
Quite interesting remark of yours !
Would you still mind elaborating a little further about your quoted formula "f*HP=0.0032" ?
If so, it would imply here that HP=0.0032/0.003352811=0.9544230 , which is a value quite close from the actual one .... in DEGREES (Actual HP=0°.98) ...
From the above formula I would have rather expected to derive HP in dimensionless radians vs. in degrees.
... therefore I'm a little lost.
*******
A little "experimental" extra :
With ...
Dt = Topocentic Distance between Observer and Moon Center, and
Dg = Geocentric Distance between Earth Center and Moon Center,
... and since our just computed "0.954420" coefficient is slightly below unity, I wondered whether it could be related to some averaged value of the Dt/Dg dimensionless ratio.
I therefore just played with my Calculator and found the following.
If you use the value "1/298.257 * Dt/Dg" instead of the (averaged?) coefficient "0°.0032" then you get an error on the Parallax significantly reduced (by a factor from 2 to 5).
Interesting again ???
*******
Best Regards
Antoine M. "Kermit" Couëtte
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