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Hi sir,
I am a french amateur Astronomer who uses XEphem from the start ... and a bit surprised by your
somewhere nervous attitude ...??

The position of the IMCCE concerned official files are there:


I advise you that the stupidity of some people at Firefox and other browser to suppress the ftp sites access.
So you must use FileZilla or other tricks to pick-up these files there.

These files were generated specially for XEphem by Mr.Valery Lainey, the astronomer in charge of that work.
With Valery Lainey we carefuly calibrated the strict format of polynomials files named XXX.2040

We must be aware that the IMCCE professionals have no reason to help us, but their kindness for other
astronomers work like Elwood, Mr Lainey and others ... so I thank them again.

I did an XEphem fork to complete (about 10th lines of code extensions) to extend your access for 20 years more to the moons position.
Brandon Craig Rhodes very nicely took his time to verify my pull ... everything is now OK.

You can "git clone "
get to GUI/xephem , make ...
(I recommend to you to copy all the? .2040 files (as .9910 and? .1020) in your /usr/local/xephem/auxil/ directory.

We checked that with no heck on Ubuntu, Debian, Mageia linux distros on x86-32/64 and the Mac.

Best regards,
Serge.

It looks like those moon models came from the Bureau des Longitudes.? The XEphem bdl.c code mentions an FTP site that isn't there any more.? The Wiki Pedia says BDL's ephemeris functions have been taken over by Institut de Mécanique Céleste et de Calcul des ?phémérides but I can't get into imcce.fr by anonymous FTP to see whether they have a directory analogous to the one mentioned in the XEphem code.

Someone more knowledgeable than myself would have to look at this.? I haven't divined from the bdl.c code what all the various fields in the XEphem model files are.



On 9/9/21 5:53 PM, Elwood Downey wrote:

Those messages refer to the moons, not the planets. But yes, the last model I installed expired Jan 1 2021.

The models were generated by an observatory in France, the details escape me at the moment but there's another thread on here somewhere where someone was trying to track it down and get updates. There are separate files for moons of mars, jupiter, saturn and uranus named mars.1020 etc (where 1020 means the model is good from 2010 to 2020). Once you get the new model files in auxil, each instance of use_bdl() in the four corresponding *moon.c source code files also needs updating to accept the new date range of the models. Or better yet, continue with my file naming convention and change the code to infer the file name automatically, then no future code changes would be required.

Elwood

-- 
Serge Montagnac + GPG Key 0xDF083D7B + 
  Nature, Not Human Activity, Rules the Climate.