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
<Iskierka>
a straight line back-and-forth is (by best approximation) an eccentricity of ~1, with a finite apoapse
<galois>
title: Andrew Symes on Twitter: "Jupiter's Great Red Spot has been changing by the day lately. It's as if a "piece" of the GRS has been breaking away! Here is a nice comparison by DMach on the Cloudy Nights forum.… https://t.co/QPQjOtauer"
<UmbralRaptop>
SilverFox: what Iskierka typed. An eccentricity of 0 is a circle.
<SilverFox>
Ah yes, I had that backwards, but doesn't change what I'm asking for
<Iskierka>
define the axis you need it to move across
<SilverFox>
Yes
<SilverFox>
if it's only moving along one, it doesn't matter which one, space is infinite
<Iskierka>
There are many reference frames, however
<SilverFox>
it needs to move like a pendelum, but only along one axis
<SilverFox>
whether it be X, Y, or Z
<SilverFox>
back and forth, that's it
<SilverFox>
is this possible, is my question
<Iskierka>
whose x, y, or z. The sun's relative axes are not the same as earth's.
<SilverFox>
it doesn't matter
<SilverFox>
Point A <---------> Point B
<SilverFox>
that's it, just back and forth
<Iskierka>
a straight back and forth above the earth is a jaggy circle around the sun
<SilverFox>
not around a set object, but being pulled between two points over and over
<Iskierka>
it does matter
<UmbralRaptop>
I assume that this is for game purposes, so you have. preferred reference frame?
<galois>
title: 〈 Berger | Dillon 〉 on Twitter: "Whatever you do, do not show this to undergrads.… "
<SilverFox>
this is not for game purposes, but if the answer is known then it could be simulated in Universe Sandbox 2
<SilverFox>
is there a stable sytem arrangement that would make a body move back and forth along a single axis
<UmbralRaptop>
stable: not really. In equilibrium: yes
<SilverFox>
Hmmm, how would that be accomplished?
<SilverFox>
could you provide a drawing?
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<UmbralRaptop>
eg: an Alderson Disk
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<SilverFox>
"Because the Sun remains stationary, there is no day/night cycle, only a perpetual twilight. This could be solved by forcing the Sun to bob up and down within the disk, lighting first one side then the other.[3]"
<SilverFox>
how you get the sun to bob like that though
<UmbralRaptop>
Carefully
<UmbralRaptop>
(Note that the disk grossly outmasses the star)
<SilverFox>
Right
<SilverFox>
but I assume the disk has equally distributed mass
<SilverFox>
and you can't force a gyroscope one way or the other because preservation of thingamabobs
<SilverFox>
Perhaps if you applied massive force at equidistant points on a single side to get it started?
<SilverFox>
is there a way of making such movement possible, with only celestial bodies?
<UmbralRaptop>
Possibly something like shkadov thrusters, but presumably this is solved during the disk construction process
<SilverFox>
oh, and because the disk would have to be assembled in pieces, it would have spin on it as well
<SilverFox>
but I assume as it grew mass the spin would slow down, and would have an opposite effect on the sun's spin eh?
<SilverFox>
and if you built it one side at a time you'd crash into the sun
<UmbralRaptop>
… the disk doesn't need to spin once assembled. Just have the star bob
<SilverFox>
it doesn't need to, but it would have to, wouldn't it?
<SilverFox>
just by effect of stuff having to orbit the star, otherwise they'd crash into it
<mofh>
UmbralRaptop: remind me to direct egg's cat at Jupiter once i'm in ANBO again (assuming the GRS doesn't evaporate entirely by that point).
<UmbralRaptop>
mofh: uh, sure
<UmbralRaptop>
(a cat looking through a cat?)
<mofh>
i mean i'm pretty sure ANBOcat has looked thru the finder at least once, tho i'm not sure it was particularly interested in what it saw.
<galois>
title: Peter Barfuss 𒀱 on Twitter: ""The variational bicomplex is a cochain complex of the differential graded algebra of exterior forms on jet manifolds of sections of a fiber bundle." okay what the fuck am i reading?"
<UmbralRaptop>
If nothing else, it would be easy to have a catgirl looking through a cat, while a cat sits on her lap.
<mofh>
like the worst part is I understand what all those concepts mean, and them in combination does not sound nice.
<UmbralRaptop>
aaaaaaaa
<mofh>
UmbralRaptop: so not sure if I count as the first of those, but if I do, then I've at least done the second and third independently. Granted, this is hindered a bit by ANBOcat liking to be inside or walking around during evenings.
<galois>
title: Dilip Sharan on Twitter: "Actually I would say the opposite. Shorter exposures could if done correctly lead to less noise. See talk of Dr. Robin Glover (Author of Sharpcap imaging software).https://t.co/M01DPOupOV… https://t.co/ygWq2HT2lb"
<egg|z|egg>
hot pixels, variability by row, the corners seem hot for some reason
<egg|z|egg>
(might just be that they *are* hot, thermally)
<mofh>
egg|z|egg: i mean apart from the hot corners, it more or less DOES seem uniformly randomly distributed?
<egg|z|egg>
yeah
<egg|z|egg>
mofh: + hot pixels
<mofh>
huh, top left corner is fine and top right is really weird
<egg|z|egg>
yes, the sensor is not a spherical cow
<egg|z|egg>
mofh: but the point of darks is that uniformly distributed per pixel doesn't tell you anything useful to make an image out of multiple pixels
<egg|z|egg>
mofh: and scaling the darks depending on temperature and exposure length induces additional madness (because pixels might respond differently to that), so that's why it's easiest to take darks in the same conditions
<mofh>
egg|z|egg: i mean scaling them based on temperature shouldn't work at all, since different parts of the sensor may respond at varying pace to thermal excitations
<mofh>
egg|z|egg: but again, this sensor is doing a pretty decent job approximating a spherical cow regardless :p
<egg|zzz|egg>
mofh: yes, but do you get the point of darks now
<egg|z|egg>
GUM 4.3.7 "In other cases, it may be possible to estimate only bounds (upper and lower limits) for Xi , in particular, to state that “the probability that the value of Xi lies within the interval a− to a+ for all practical purposes is equal to one and the probability that Xi lies outside this interval is essentially zero”. If there is no speciflc knowledge about the possible values of Xi within the inte
<egg|z|egg>
rval, one can only assume that it is equally probable for Xi to lie anywhere within it (a uniform or rectangular distribution of possible values — see 4.4.5 and Figure 2 a)."
<egg|z|egg>
mofh: would this kind of interval be a decent way to represent station-kept aspects (phasing, MST AN, orbit freezing)?
<egg|z|egg>
hm
<egg|z|egg>
then again I'm still not trying to measure an underlying value, merely to estimate a dispersion
<egg|z|egg>
though I do have all discrete values on the timespan of interest
<egg|z|egg>
meow.
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<mofh>
egg|z|egg: i can't see why it *wouldn't* be acceptable at the least.
<egg|z|egg>
mofh: does it even make sense
<egg|z|egg>
mofh: after all what I'm trying to convey is the spread of the terrestrial longitudes of the ascending node (modulo equatorial shift), or the spread of the MST AN, or something
<galois>
title: Musée du Louvre on Twitter: "⚠ Fermeture exceptionnelle ⚠En raison d’un droit de retrait effectué par une partie des agents d’accueil et de surveillance du musée lié à la forte affluence, le musée du Louvre sera exceptionnellement fermé ce lundi 27 mai 2019."
<galois>
title: Élections européennes de 2019 en France — Wikipédia
<galois>
[WIKIPEDIA] Élections européennes de 2019 en France#/media/File:Sondages sur les élections européennes de 2019 en France.svg | "Les élections européennes de 2019 en France se tiennent les 25 et 26 mai 2019, afin de désigner les députés représentant la France au Parlement européen.Le mode de scrutin français connaît un changement par rapport aux élections de 2014, avec le passage de huit circonscriptions interrégionales à un
<UmbralRaptop>
EELV?
<galois>
EELV: Evolved Expendable Launch Vehicle
<egg|work|egg>
!acr -add:EÉLV Europe Écologie Les Verts
<galois>
Definition added!
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* egg|z|egg
meows at mofh
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* mofh
meows at egg|work|egg
* mofh
also meows at egg|z|egg
<egg|z|egg>
so many eggs
* UmbralRaptop
caws at egg|cell|egg, egg|work|egg, egg|zzz|egg, and egg|z|egg
<galois>
title: 𝑦𝑒 Nice ﹠Accurate Jeremy Yoder on Twitter: "Tired: What’s your sign?Wired: What’s your Chinese zodiac year?Inspired: What’s your birthdate in the calendrier républicain?(Pour moi, c’est le martagon!) https://t.co/CIgEvAebJkhttps://t.co/RDOX4l2FkA… https://t.co/L4qUMl24Ht"
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<egg|z|egg>
mofh: the astronomical definition is obviously the right one, but wikipedia uses the Romme thing