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RE : https://NavList.net/m2.aspx/Longitude-calculator-theodolite-Pennino-jun-2013-g24454

Hello again Bruce,

The recent post by Andrew Nikitin (RE : https://NavList.net/m2.aspx/Longitude-calculator-theodolite-Nikitin-jun-2013-g24482) ....

.... and BTW Hello to you also Andrew, and thanks for your contribution :-)

... prompted me into looking more closely at your post.

Your initial aim was to work on averaged values, which I had failed so far to take in due consideration.

Therefore, I worked this time on your averaged values, and I had the excellent surprise to compute an intercept of only 0'06, i.e. 3.7".

Since 3.7" is the same magnitude order as the accuracy of the "approximate Ephemeris" I am using, I then went for an "exact" Ephemeris in order to get some sensible and meaningful analysis from your averaged data. Cherry on the cake : when using the super accurate INPOP10a Ephemeris your updated intercept now becomes 0'0542 (i.e. 3.25"), yielding a Longitude determination only 0'.273 from your actual one : see enclosed updated document(s) Rev1 JUNE 26th, 2013.

Really well done, and Congratulations !

Now it would certainly be worth knowing your actual environment data, i.e. Pression and Temperature. Maybe one way to even improve your intercept ! Thanks in advance for indicating it !

Best Regards

Kermit

Antoine M. "Kermit" Couëtte
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