raptop changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer. | We can haz pdf
<egg> mofh: honestly I would just look at the filenames, not even the sizes
<egg> you would need an entirely new and exciting failure mode for them to have distinct versions of the files
<egg> they just seem to be bad at replication
<egg> also wondering how many dialects i will put up with before i prefix the Dialect enum with // עַל־כֵּ֞ן קָרָ֤א שְׁמָהּ֙ בָּבֶ֔ל כִּי־שָׁ֛ם בָּלַ֥ל יְהֹוָ֖ה שְׂפַ֣ת כׇּל־הָאָ֑רֶץ
<mofh> LOL
<mofh> Honestly I think that's already applicable :p
<egg> meh, there are only 4 that i parse
<egg> ILRSA, ILRSB (of course the two official ILRS products are nonconformant and in different ways), GRGS at IDS, and Chinese MGEX (IGS)
<egg> from all three services that use SP3 :-p
<egg> mofh: spot the synchronous satellites https://i.imgur.com/3uvumsR.png
<egg> (that's the evolution assuming no manoeuvres, from wherever the line starts)
<mofh> egg: G01, R01, C11 :p
<mofh> also maybe E01?
<egg> mofh: no
<egg> you got it backwards
<egg> those are the semisynch and near-semisynch ones
<egg> GPS, ГЛОНАСС, 北斗 MEO, Galileo
<mofh> ...wouldn't synchronous mean that the terrestrial longitude of the ascending node is constant over time?
<egg> so this is the terrestrial longitude every repeat ground track cycle
<egg> so if they are all phased right they should all stay in place
<egg> but synchronous orbits are not really stable, what with the earth staying put beneath the satellite instead of averaging the gravitational field
<egg> (it's actually the terrestrial longitude at every ascending node with an offset corresponding to the repeat ground track cycle so there are more points)
<mofh> okay I have it backwards, since I was assuming that synchronous orbits are *more* stable than semisynch *because* the earth stays put beneath the satellite instead of averaging the gravitational field.
<mofh> which, upon reflection, that's not how orbital mechanics work.
<egg> mofh: obviously if i showed *all* ascending nodes without compensation for the RGT cycle, GPS would be 2 parallel lines, and then ГЛОНАСС would be 17 parallel lines, Galileo as well, and 北斗 C11 would be 13 lines
<egg> instead I contract all those into the line corresponding to whichever AN happened to be first in my analysis
<mofh> Ahh
<egg> mofh: also, here is what happens to those near-semisynch sats https://i.imgur.com/lGkGK8S.png
<egg> note, that might be dominated by model errors
<egg> not sure how much radiation pressure influences those
<egg> the phasing triplets for those are [2 ; -1 ; 7], [2 ; -3 ; 10], [2 ; 0 ; 1], [2 ; 1 ; 8]
<mofh> Huh, interesting.
<mofh> what are the smol oscillations in R01 and E01?
<egg> no idea
<egg> absolutely no idea what's going on in that graph tbh
<egg> this seems like way more drift than there should be
<egg> mofh: anyway how goes the mgex mirror poking
<mofh> like that *does* seem like it's drifting a fair bit, yeah
<mofh> slowly, but I think I finally have a usable diff list
<mofh> sec
<kmath> <Marco_Piani> Fun fact: in taking the image of the M87 black hole, which constitutes a test of Einstein’s general relativity,… https://t.co/BAzgvmlStg
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<UmbralRaptor> Objection: it was assuming the weak field case, and testing in the strong field case
<UmbralRaptor> (I mean, yes, but I was feeling pedantic)
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<mofh> UmbralRaptor: heh, that's an interesting point
<mofh> (and sadly I feel like I know too little GR to properly appreciate that :/)
* UmbralRaptor doesn't know all that much about GR >_>;;
<UmbralRaptor> Paper I does mention this constraining and/or ruling out some GR replacements, and weird things that don't follow the Kerr metric
<mofh> I thought this was a Schwarzchild sol'n? (Leaving outside the claim a friend of mine made that black holes w/zero angular momentum don't really seem to eggsist)
<egg> <mofh> sec <<< NOOOOOOOOOOOO NOT A MOFHSEC
<UmbralRaptor> It's a Kerr solution, and if your friend is talking about astrophysical black holes rather than mathematical ones, I find that plausible
<egg> mofh: i mean they do eggsist in the classroom,
<egg> mofh: anyway, MGEX
<egg> nyawya
<mofh> UmbralRaptor: I mean yes, we are talking about astrophysical ones
<UmbralRaptor> (Like, collapsing star would suggest a lot of spin up. Any supermassive black hole with the fancy disk+jets probably has enormous angular momentum…)
<mofh> UmbralRaptor: do spherical cows have zero angular momentum,
<mofh> egg: ^
<mofh> mew
<UmbralRaptor> mofh: please do not make the cows undergo core collapse
<UmbralRaptor> (gah, I'm probably sounding really angry tonight)
<egg> mofh: mgeggs
* UmbralRaptor vaguely wonders how much angular momentum a typical galaxy cluster has o_O
<mofh> egg: working on it
<mofh> also mgeggs sounds like some sort of vaguely paraboloid chunk of Magnesium
<mofh> also like, what the hell mirror is ENSG, btw? like it seems to have so many gaps as to be basically useless
<mofh> on top of the fact that it runs on, like, an Apple ][
<mofh> also on a completely random note why the *fuck* do I find listening to the Sonic 2006 soundtrack really calming?
* egg swats mofh
<mofh> egg: my question on ENSG still stands
<egg> yeah
<egg> the fact that all of WHU is missing from CDDIS is similarly disturbing
<egg> esp. since CDDIS is supposed to be the primary,
<mofh> Which sat is WHU?
<mofh> also that's really puzzling, yeah, like for instance IGN has a "sync'd from CDDIS!!!" file in many dirs, yet there's content on IGN that's not on CDDIS *somehow*
<mofh> Like how on earth does that even *happen*?
<egg> mofh: WHU is an AC, not a sat
<egg> WHU tracks all of them
<egg> whu?
<egg> WHU?
<galois> WHU: WuHan University (武汉大学)
<egg> the MGEX ACs are CODE (AIUB), GFZ, GRGS, SHAO, TUM, WHU
<egg> the WHU files are called WUM for some reason
<egg> JAXA also provide files (but they are not an MGEX AC)
<mofh> AC?
<mofh> oh Analysis Center
<egg> mofh: meow
<X> Ah good old wuhan
<X> 武汉大学
<X> My pin yin is still on key.
<X> 可以做大学吗
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<egg|laptop|egg> mofh: MGEX
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<egg> AC?
<egg> !acr -add:AC Analysis Centre
<galois> Definition added!
<egg> mofh: MGEX
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<mofh> egg|work|egg: finally done, uploading comparison files. seems CDDIS/IGN diffs are smoler than I was worried over
<mofh> egg|work|egg: https://twitter.com/Maitre_Eolas/status/1116343667424485382 also my fav French word is now "shitstorm" :P
<kmath> <Maitre_Eolas> Alors comme je sens la shitstorm arriver, une précision pour ceux que la vérité intéresse : NON, un juge fédéral am… https://t.co/rUwQnl0vao
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<oeuf> mofh: meow
<oeuf> mofh: do you have the comparison files,
<oeuf> mofh: meanwhile i am staring at the residuals between principia's integration and the sp3 files and failing to understand
<oeuf> mofh: meow
* oeuf stares at residuals in confusion
<oeuf> !acr -add:ECOM Empirical CODE Orbit Model
<galois> Definition added!
<_whitenotifier-3d18> [Principia] eggrobin reviewed pull request #2131 commit - https://git.io/fjqME
<_whitenotifier-3d18> [Principia] eggrobin reviewed pull request #2131 commit - https://git.io/fjqMu
<_whitenotifier-3d18> [Principia] eggrobin reviewed pull request #2131 commit - https://git.io/fjqMz
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<oeuf> !acr -add:GRS Geodetic Reference System
<galois> Definition added!
<_whitenotifier-3d18> [Principia] pleroy reviewed pull request #2131 commit - https://git.io/fjqM5
<_whitenotifier-3d18> [Principia] pleroy reviewed pull request #2131 commit - https://git.io/fjqMd
<_whitenotifier-3d18> [Principia] pleroy reviewed pull request #2131 commit - https://git.io/fjqMF
<_whitenotifier-3d18> [Principia] pleroy synchronize pull request #2131: Fix null pointer exception in the flight plan and avoid UI flickering - https://git.io/fjqW4
<_whitenotifier-3d18> [Principia] eggrobin labeled pull request #2131: Fix null pointer exception in the flight plan and avoid UI flickering - https://git.io/fjqW4
<_whitenotifier-3d18> [Principia] Pending. Build queued… - 
<_whitenotifier-3d18> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/3549/
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<_whitenotifier-3d18> [Principia] Failure. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/3549/
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<oeuf> mofh: mgex
<UmbralRaptor> mofh + regex = mgex?
<_whitenotifier-3d18> [Principia] pleroy commented on pull request #2131: Fix null pointer exception in the flight plan and avoid UI flickering - https://git.io/fjqDw
<_whitenotifier-3d18> [Principia] Pending. Build queued… - 
<_whitenotifier-3d18> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/3550/
<oeuf> UmbralRaptor: hm.
<mofh> UmbralRaptor: I mean that is basically what was needed for mgex stuff
<UmbralRaptor> hrm
<mofh> oeuf: apologies, THERE WAS A BLOODY POWER OUTAGE ON CAMPUS WTF
<mofh> uploading stuff now
<egg|laptop|egg> mofh: did you touch or approach or otherwise entangle yourself a device that was connected to mains power
<egg|laptop|egg> mofh: we know that you can cause the ZVV ticket machines to reboot by touching them, so this is just a larger version of the same
<mofh> rofl
<mofh> also shit, the IL lander got within 9km of the lunar surface before a main engine issue, then it seems to have impacted the surface. :(
<mofh> talk about absurdly close :/
<UmbralRaptor> ow
<_whitenotifier-3d18> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/3550/
<_whitenotifier-3d18> [Principia] pleroy pushed 7 commits to master [+0/-0/±7] https://git.io/fjqyT
<_whitenotifier-3d18> [Principia] pleroy 2d2aadf - Extract a function that doesn't touch widgets.
<_whitenotifier-3d18> [Principia] pleroy 79f1955 - Fix an exception by nailing the first future manoeuvre at layout time.
<_whitenotifier-3d18> [Principia] pleroy 515b0c4 - Avoid flickering.
<_whitenotifier-3d18> [Principia] ... and 4 more commits.
<_whitenotifier-3d18> [Principia] pleroy closed pull request #2131: Fix null pointer exception in the flight plan and avoid UI flickering - https://git.io/fjqW4
* egg|laptop|egg meows at the mofh GNSS eggsperiment
<mofh> rofl
<mofh> how do the residuals look like, anyhow?
<kmath> <PrototypeCube> Can't wait for the police to go back to the ecuadorian embassy on the 24th to arrest Gregorian Assange too
<SnoopJeDi> ow
<UmbralRaptor> hah
<egg|laptop|egg> mofh: weird.
<egg|laptop|egg> mofh: anyway mgeggs
<egg|laptop|egg> mofh: mgeeeeeeeeeeeeeeex
<oeuf> mofh: tbh it is probably silly to compute the residual acceleration as the difference between principia-computed and given acceleration, when the velocities aren't really given but computed by difference formulae anyway
<_whitenotifier-3d18> [Principia] pleroy opened pull request #2132: More compact UI - https://git.io/fjqSx
<_whitenotifier-3d18> [Principia] Pending. Build queued… - 
<_whitenotifier-3d18> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/3551/
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<oeuf> FORTRAN?
<oeuf> !acr -add:FORTRAN FORmula TRANslation
<galois> Definition added!
<oeuf> !acr -add:WATFOR WATerloo FORTRAN
<galois> ...
<oeuf> !acr -add:WATFIV WATerloo FORTRAN IV
<galois> ...
<oeuf> pretty much
<oeuf> !acr -add:ALGOL ALGOrithmic Language
<galois> ...
<oeuf> mofh: meow
<_whitenotifier-3d18> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/3551/
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* oeuf stabs mofh with a flyswatter
<oeuf> mofh: what is it with the orange website and geometric algebra https://twitter.com/stephentyrone/status/1116431749142200320
<kmath> <stephentyrone> @jerrykuch @johnregehr I'm just going to pretend that this utterly predictable gem is the only thing I've seen on H… https://t.co/9CLMkhnMIe
<oeuf> !tell mofh meow
<galois> oeuf: I'll pass that on when mofh is around.
<oeuf> mofh: hm but it's not the finite differences, I get the same residuals (smoother) with the NGA file you sent me, which has velocities
* UmbralRaptop chooses to believe that œuf is that smol black cat that's in some of the pics on mofh's alt.
<egg|laptop|egg> UmbralRaptop: cat egg
* egg|laptop|egg pokes GNSS orbits with a pointed stick