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  1. Did I say Player.log? No, I didn't. I cannot make sense of your post. Reminder: for anyone wishing to report bugs about Principia, please follow the instructions in the FAQs.
  2. Technically, Principia doesn't quite control the movement of parts. It does control the movements of parts-that-are-in-contact-with-each-other (we call these things "pile-up") and let KSP do the part placement within the pile-ups. There is no way to separate this from N-body physics because precisely N-body physics is the integration of the motion of pile-ups. At least, that's a nice picture . But obviously, it's not supposed to happen. Ideally, if you could reproduce the problem with the stock game and give us a save, that would be great. If not, I would suggest looking at the mods that you use and see if any one of them believes that it can change the location of parts; mods that do this are typically incompatible with Principia (see the FAQs for details). You can try removing the mods one-by-one to determine which one interacts with Principia.
  3. Believe it or not, the Earth is not a perfect sphere. It is flattened at the poles (oblate) and it has mountains and oceans that make its gravity field inhomogeneous. Principia simulates this, so for instance geostationary orbits are only stable in some places (over India and Mexico), elsewhere they need stationkeeping. The effect you are seeing is mostly due to oblateness.
  4. For the real solar system, it's quite easy, we used the JPL Horizon System which gives us real-life numbers. For a fictitious system, however, things might get more challenging.
  5. Have you read the concepts page and taken a look at @rsparkyc's tutorial? I'd suggest doing so before randomly clicking buttons.
  6. Just to clarify: are you saying that हरीश चंद्र works for you but Hausdorff (the version immediately after) does not? That's interesting to know and quite puzzling as there were very few changes in between.
  7. I think you'll have to try progressively older versions of Principia (older download links can be found in the history of README.md on GitHub). We are building on Ubuntu 20.04, which apparently pulls this version of libm. I believe that the last version built on Ubuntu 18.04 (which may or may not have the version of libm you need) was Hardy.
  8. You have version 11 of the libraries, we require version 8, so that should not be the problem. Is there any useful message in KSP.log?
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