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RE : http://fer3.com/arc/m2.aspx/Oblateness-formulas-Stuart-jun-2013-g24359

Dear Stuart,

Thank you very much for your reply.

I have taken a close look at your "RStuartEllipsoidParallax.pdf" document which is excellent and self explanatory.

Then, as I earlier suspected the NAL formula is a series approximation to a full series. You are also confirming that the 0.°0032 Coefficient is based on an averaged 57.7' value for parallax, which is also what Andrés seemed to imply in his last post on the subject (see : http://fer3.com/arc/m2.aspx/Oblateness-formulas-Andr%C3%A9sRuiz-jun-2013-g24325).

Accordingly, if I am using the value "1/298.257 * Dt/Dg" instead of 0.°0032 I am actually deriving a closer value. I have to confess that I was quite lucky on that one (see : http://fer3.com/arc/m2.aspx/Oblateness-formulas-Couëtte-jun-2013-g24329).

As regards the accurate Augmented SD and Parallax 3D space determination, I fully agree with your comments. This is the only method I have been using for quite some time.

Thank you again and

Best Friendly and "Parallaxian" Regards

Kermit

Antoine M. "Kermit" Couëtte
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