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Hi all
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<div>Sorry I have been on leave so this may be late/irrelevant.</div>
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<div>I don’t understand the motivation to try and update calcServer. Surely moving to difxCalc is easier and much better use of effort.</div>
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<div>For the ocean loading etc, if telescopes are mussing, why not just add them. There is a European (from memory) webpage which uses the same software to compute these values for arbitrary position.</div>
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<div>Though having said that my memory is I failed to successfully add the new values to the tables which come with difxcalc. </div>
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<div>It would be great if someone who knows how to do this could add some notes to the diff wiki (or readthedocs).</div>
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<div>Cheers</div>
<div>Chris</div>
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<blockquote type="cite">
<div>On 29 Jan 2025, at 01:17, Walter Brisken via Difx-users <Difx-users@listmgr.nrao.edu> wrote:</div>
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<p>Hi Jan,</p>
<p>This is great. If you can point me to a copy of the ephemeris file I can update the calcServer in gitlab.</p>
<p>Cheers,</p>
<p>Walter<br>
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<div class="moz-cite-prefix">On 1/28/25 01:25, Jan Wagner wrote:<br>
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<blockquote type="cite" cite="mid:CABEA3toAXGyOtP8KgVR5T4C_+-8kcEy6wNJ8oxonJ9W+NAKNaw@mail.gmail.com">
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<div dir="ltr">Hi David,<br>
<br>
interesting to hear about the internals, esp. that the record lengths of DE403 and DE421 are identical. Apparently, data structures are, too. I did not expect DE403/DE421 files to be interchangeable in terms of structure.</div>
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"Can you try the calc9 server as is using DE421?" --> Indeed, that fixed it! Wow.<br>
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Now VLBI track m25020 of 20th January 2025 works under calcif2. As does a copy of m25020 shifted to year 2045.</div>
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The steps were:<br>
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cd $DIFXROOT/share/CalcServer/<br>
cp $DIFXROOT/share/difxcalc/DE421_little_Endian .<br>
mv JPLEPH DE403_little_Endian<br>
ln -s DE421_little_Endian JPLEPH<br>
startCalcServer<br>
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It's a bit ridiculous that it was actually that simple! :P<br>
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Many thanks again!!<br>
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Kind regards,<br>
Jan</div>
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<div class="gmail_quote gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Thu, Jan 23, 2025 at 9:33 PM Gordon, David CIV USN NAVOBSY DC (USA) <<a href="mailto:david.gordon126.civ@us.navy.mil" moz-do-not-send="true" class="moz-txt-link-freetext">david.gordon126.civ@us.navy.mil</a>> wrote:<br>
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Jan,<br>
<br>
The record lengths (8144 bytes) appear to be the same for DE403 and DE421.<br>
I put together a short program using the relevant subroutines from the calc9<br>
version of cpepu.f and ran it with the DE421 ephemeris. It ran with no problems.<br>
DE421 seems to be good up to Jan. 2, 2050. Can you try the calc9 server as is<br>
using DE421?<br>
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If that doesn't work I think I can make a new DE403 file with data from 1900<br>
to 2100. I think JPL may have made some changes in DE403 since I originally<br>
made a binary version around 26+ years ago. I recall ascii files being in chunks<br>
of 25 years. Now they are 100 years. And the record length may have been<br>
7144 bytes. John Benson may have made the file you have sometime later<br>
with the larger record lengths. Or whatever. Let me know how things go.<br>
<br>
David<br>
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