egg changed the topic of #principia to: Logs: https://esper.irclog.whitequark.org/principia | <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly…
<queqiao-> ⟨patrikcath⟩ ⟪Starmincer⟫ One large two small I think. ⮪ >"I think"
<queqiao-> ⟨Bee Rights Activist⟩ "Magpie bridge is falling down, falling down, falling down
<queqiao-> Magpie bridge is falling down my round egg
<queqiao-> Build it up with more RAM sticks, more RAM sticks, more RAM sticks
<queqiao-> Build it up with more RAM sticks, my round egg"
<queqiao-> ⟨Bee Rights Activist⟩ though I highly doubt you can even get more RAM for an IRC bridge
<queqiao-> ⟨Bee Rights Activist⟩ * it is even possible to
<queqiao-> ⟨Bee Rights Activist⟩ "Patch it up no memory leaks, memory leaks, memory leaks
<queqiao-> Patch it up no memory leaks, my round egg"
<queqiao-> ⟨Bee Rights Activist⟩ am I describing a bridge or a dam
<queqiao-> ⟨Bee Rights Activist⟩ * dam, let's say the magpie bridge is built on top of a dam that stops wind or something
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<queqiao-> ⟨egg⟩ ⟪Bee Rights Activist⟫ though I highly doubt it is even […] ⮪ I did, so I suppose it was possible…
<queqiao-> ⟨egg⟩ It would also fall down without any […] ⮪ Looked at the available memory graph for the VM that hosts 鹊桥IRC, the vertical line is when Butcher posted cats.
<_whitenotifier-1adf> [Principia] eggrobin opened issue #3615: Something is amiss in the reference frames whose axis of rotation varies - https://github.com/mockingbirdnest/Principia/issues/3615
<queqiao-> ⟨Starmincer⟩ More cat, for testing purposes obviously. 🤔
<queqiao-> ⟨egg⟩ yup
<_whitenotifier-1adf> [Principia] pleroy commented on issue #3615: Something is amiss in the reference frames whose axis of rotation varies - https://github.com/mockingbirdnest/Principia/issues/3615#issuecomment-1519062230
<_whitenotifier-1adf> [Principia] pleroy opened pull request #3616: A correct compulation of the angular velocity of a frame - https://github.com/mockingbirdnest/Principia/pull/3616
<_whitenotifier-1adf> [Principia] pleroy commented on pull request #3616: A correct computation of the angular velocity of a frame - https://github.com/mockingbirdnest/Principia/pull/3616#issuecomment-1519107159
<paculino> That cat looks disgusted/annoyed by something.
<raptop> maybe the cat needs more pets
<queqiao-> ⟨Zeusbeer⟩ I love anthropomorphism
<paculino> Cats can certainly be annoyed
<queqiao-> ⟨🇺🇦 Katniss 🇺🇦⟩ ⟪paculino⟫ That cat looks disgusted/annoyed by […] ⮪ Cat looks disappointed imo
<queqiao-> ⟨Zeusbeer⟩ You can only say that if you have also seen the cat happy and neutral
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<queqiao-> ⟨egg⟩ Now for the awkward question: how do we display the speed in the rotating-pulsating reference frame?
<queqiao-> ⟨kingparity⟩ what is the rotating pulsating frame?
<queqiao-> ⟨kingparity⟩ +i tried building the dev version with it a few days ago and failed lol
<queqiao-> ⟨cola98765⟩ Is there a way to lock the time base, so when I change time of the first node, others also move with it?
<queqiao-> I have really low TWR and wanted to do 3 passes around Earth, and locking those nodes together would make aiming much easier.
<queqiao-> ⟨egg⟩ See Section 5 of https://github.com/mockingbirdnest/Principia/blob/master/documentation/Rotating%20Pulsating.pdf. It is the reference frame which fixes the centres of _both_ the Earth and the Moon.
<queqiao-> ⟨egg⟩ Since the distance between these centres is not fixed, the reference frame pulsates, that is, things of constant physical size periodically grow and shrink in the rotating-pulsating frame.
<queqiao-> ⟨egg⟩ The reasonable thing is probably to express the speed in current metres per second; it could be expressed in constant lunar distances per month or something like that, but that would be very hard to work with; and the Δv you apply is in current metres, not in constant metres.
<queqiao-> ⟨egg⟩ Principia: now with inflation
<raptop> ...does that mean that other fancy physics will be included, so the orbits of Mercury and GPS satellites will finally be correct?
<raptop> >_>
<queqiao-> ⟨egg⟩ Adding this reference frame did require us to think a little bit about covariance and contravariance, but we have mostly skirted the problems in a somewhat hacky way; so we are not actually ready to tackle that.
<queqiao-> ⟨kingparity⟩ i see i see, i got no clue lol
<queqiao-> ⟨kingparity⟩ principia now with inflation is funny lol
<queqiao-> ⟨Bee Rights Activist⟩ this rotating pulsating frame sounds like a lot of work (and give me a few years to learn more math so I can maybe understand the physics) but I hear it is the only way to fix the locations of lagrange points at, well, points. variable mass sounds like a pain
<queqiao-> ⟨Bee Rights Activist⟩ * size