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>
(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
<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
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)
<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
<_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
<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
<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