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
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<egg> mofh: 旅行者2号!!! https://www.bilibili.com/video/av25804151
<galois> title: 【坎巴拉太空计划】高仿旅行者2号,一箭飞掠四大气态巨星(RO+多体引力)_哔哩哔哩 (゜-゜)つロ 干杯~-bilibili
<mofh> also that is a *nice* Principia video
<egg> mofh: which one
<egg> mofh: it's also not a TTF that windows accepts
<mofh> the very first
<mofh> ...amazing, what the heck is the error message
<egg> not a valid font file
<egg|zzz|egg> <mofh> the very first << okay but you should watch the voyager one too
<mofh> egg|zzz|egg: yes i'm making my way thru them in order
<egg|zzz|egg> mofh: oh wow check discord
<egg|zzz|egg> the author of that video is apparently competing with another person from CN on a trajectory that flies by all planets
<mofh> oh NICE. incl. inner system?
<egg|zzz|egg> I suppose? "I use 4600m/s of dv and spend 31 years to achieve it, but he only use 3892dv and 23 years"
<egg|zzz|egg> "and his dv of DSM is only 8m/s"
<mofh> That's surprisingly way way less than I'dve eggspected
<egg> mofh: "It's a E-V-V-M(Mercury)-V-V-M(Mars)-E-E-V-E-E-E-E-J-S-U-N orbit
<egg> " (pictures on discord)
<egg> where I suppose U means H and N means LV :-p
<egg> 🜨♀♀☿♀♀♂🜨🜨♀🜨🜨🜨🜨♃♄♅⯉
<egg> "My friend use a E-V-V-M-V-V-Mars-V-E-J-S-U-N orbit, he is making a video about it"
<SnoopJeDi> Trying to help a friend work out how best to find the centerline of the void in a fairly arbitrary 3D spiral shell. Does this look sane? https://i.imgur.com/90DqU3R.png
<SnoopJeDi> (I didn't draw the toy problem quite right to highlight that the most recent tangent needs updated, but this shows that a bit more: https://i.imgur.com/oLqqAVc.png)
<egg> meow
<egg> i should zzz
* UmbralRaptop points a sunbeam at egg
<egg> aaaaaaaaaaaaaaaaaaa
<SnoopJeDi> It looks like under the keyword of "curve reconstruction" there are quite a few ways to go about this problem, unsurprisingly. Oh well, it was fun to brainstorm an unsophisticated way of doing it :)
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<UmbralRaptop> egg: no, no. Cats sleep in them
<egg|cell|egg> Hmm
<egg|cell|egg> Space cat
<egg|cell|egg> Parker solar cat
<SnoopJeDi> evidently what my colleague wants is called a "skeleton" and there are a surprising number of neat ways to find it: https://en.wikipedia.org/wiki/Topological_skeleton
<galois> title: Topological skeleton - Wikipedia
<galois> [WIKIPEDIA] Topological skeleton | "In shape analysis, skeleton (or topological skeleton) of a shape is a thin version of that shape that is equidistant to its boundaries. The skeleton usually emphasizes geometrical and topological properties of the shape, such as its connectivity, topology, length, direction, and width. Together with..."
<UmbralRaptop> solar cat plus
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<mofh> https://twitter.com/jamesheathers/status/1128630903775924226 I... have no words. What the *fuck*?
<galois> title: 🏴James Heathers🏴 on Twitter: "Wait, I missed this detail."Niels van de Roemer, Valley Electronics’ medical director, said earlier this year that the company has ... was justified in citing the study until it was officially removed.""
<UmbralRaptop> aaaaaaaααααα
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<galois> title: Upper Level Winds (@upperlevelwinds) | Twitter
<SnoopJeDi> wonder if they're friends with https://twitter.com/waywardboat
<galois> title: Wayward Boat (@WaywardBoat) | Twitter
<SnoopJeDi> oh yep, there's a follow link
<galois> title: Magic Realism Bot on Twitter: "A Sumerian scholar spends his life rewriting a dissertation."
<mofh> lolsob
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<galois> title: Peter Gao on Twitter: "The problem with coding in multiple languages is to keep track of whether arrays start with index 0 or 1. This message brought to you by the last half an hour that I wasted missing the fact that there is no array index 0 in fortran."
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<galois> title: Springer Nature journals unify their policy to encourage preprint sharing
* UmbralRaptop increments my computer kill count by 2
<mofh> UmbralRaptop: ngl I absolutely hate that aspect of Fortran
<mofh> it makes zero sense mathematically, and zero sense from a low-level computer perspective.
<UmbralRaptop> hrm
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<egg|work|egg> !u М
<galois> М: U+041c CYRILLIC CAPITAL LETTER EM
* egg|work|egg pets UmbralRaptop
<egg|work|egg> mofh: plenty of times when you want a range that doesn't start at 0, arbitrary index ranges are the way to go
<egg|work|egg> something something Ada
<UmbralRaptop> Does Ada let you use negative indicies?
* UmbralRaptop eyes the llama language
<egg|work|egg> sure
<egg|work|egg> or any enumeration
<UmbralRaptop> "potato", "moo", "meow"
<egg|work|egg> subtype Capital_Basic_Latin_Letter is Character range 'A' .. 'Z';
<egg|work|egg> type Monoalphabetic_Substitution_Cipher is array (Capital_Basic_Latin_Letter) of Capital_Basic_Latin_Letter;
<egg|work|egg> Meow : Monoalphabetic_Substitution_Cipher := "MEOWABCDFGHIJKLNPQRSTUVXYZ";
<mofh> 15:44:43 < egg|work|egg> mofh: plenty of times when you want a range that doesn't start at 0
<mofh> okay, I legitimately want to know when you'd want that, since I'm at a total loss when and why that would be useful.
<mofh> (also Perl used to support doing eggsactly this, for what it's worth. iirc it was virtually never used and the manpage loudly and strongly told you to not use it).
<mofh> also try redownloading that font, i think i fixed it so windows accepts it now.
<galois> title: Principia/geopotential_body.hpp at 85996503611d5b6bc4a98c4d601e4f8c05d65e6a · mockingbirdnest/Principia · GitHub
<egg|work|egg> where the alternative is to actively invite off-by-1 errors by using (m-1) as your index
<egg|work|egg> (and I'm sure you can come up with cases where indices range symmetrically around 0 better than I can)
<egg|work|egg> something something Ylm Ylm Ylm
* egg|work|egg bites mofh
<egg|work|egg> (at work, can't poke at the font right now, will look at it when i'm home)
<UmbralRaptop> lovecraftian spheres
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<egg|cell|egg> Mofh: look above, grad_σℜ = ℜʹ * r_normalized
<egg|cell|egg> If σ=1 that is
<mofh> ahh
<egg|cell|egg> You may want to look at the documentation
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<_whitenotifier-5dfc> [Principia] eggrobin opened issue #2169: The description of the target LVLH frame is garbled - https://git.io/fjlAf
<_whitenotifier-5dfc> [Principia] eggrobin labeled issue #2169: The description of the target LVLH frame is garbled - https://github.com/mockingbirdnest/Principia/issues/2169
<_whitenotifier-5dfc> [Principia] eggrobin assigned issue #2169: The description of the target LVLH frame is garbled - https://git.io/fjlAf
<egg> mofh: meow
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<_whitenotifier-5dfc> [Principia] eggrobin opened pull request #2170: Show nodes with respect to the equator - https://git.io/fjlA1
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<_whitenotifier-5dfc> [Principia] Pending. Build queued… - 
<_whitenotifier-5dfc> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/3604/
<_whitenotifier-5dfc> [Principia] Failure. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/3604/
<egg|zzz|egg> UmbralRaptop: why are XMM-Newton and CXO in those strange eggscentric orbits
<egg|zzz|egg> ah "The spacecraft spends 85% of its orbit above the belts of charged particles that surround the Earth. Uninterrupted observations as long as 55 hours are possible and the overall percentage of useful observing time is much greater than for the low Earth orbit of a few hundred kilometers used by most satellites."
<egg|zzz|egg> and "XMM-Newton’s high-technology design uses over 170 wafer-thin cylindrical mirrors spread over three telescopes. Its orbit takes it almost a third of the way to the Moon, so that astronomers can enjoy long, uninterrupted views of celestial objects. [...]XMM-Newton’s highly eccentric orbit has been chosen so that its instruments can work outside the radiation belts surrounding the Earth."
<UmbralRaptop> xray telescopes are weird
<egg|zzz|egg> UmbralRaptop: ISO does the same thing though and that's infrared
<egg|zzz|egg> ISO?
<galois> ISO: Infrared Space Observatory
<egg|zzz|egg> yay
* UmbralRaptop blinks
<egg|zzz|egg> UmbralRaptop: starting to write a design for contracts that make the player do mission design https://github.com/SirMortimer/Kerbalism/wiki/Satellite-Contracts
<galois> title: Satellite Contracts · SirMortimer/Kerbalism Wiki · GitHub
* egg|zzz|egg meows at UmbralRaptop, mofh, et al.
* UmbralRaptop places egg|zzz|egg in a cardboard box
<UmbralRaptop> also, that sat contracts page is making me think of how Hipparcos still worked despite the partial launch failure, and how Spitzer's orbit changed
<egg|zzz|egg> UmbralRaptop: eggsactly
<UmbralRaptop> (And, well, Herschel an JWST use completely different orbits)
<UmbralRaptop> Solar observations, uh, there's L1, earth-trailing/leading, and I think a sat or 2 in LEO?
<egg|zzz|egg> yeah crepuscular LEO
<egg|zzz|egg> UmbralRaptop: basically the whole point is "contract for mission constraints, not orbits"
<UmbralRaptop> And, well, remember Ulysses?
<egg|zzz|egg> what did it do
<egg|zzz|egg> whitequark: ^ KSP & mission design
<UmbralRaptop> High lattitude solar observations via Jupiter flyby
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<iximeow> ;8ball egg?
<iximeow> hm
<iximeow> !8ball ;8ball?
<UmbralRaptop> !8 should egg sleep tonight?
<galois> UmbralRaptop: yes
<egg|zzz|egg> !8 should i sleep now
<galois> egg|zzz|egg: yes
* egg|zzz|egg scritches iximeow, UmbralRaptop, whitequark, et al.
* egg|zzz|egg zzz
* UmbralRaptop scritches egg
<iximeow> myow
* UmbralRaptop pets iximeow
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<iximeow> UmbralRaptop: still waiting for news of 60mp full frame sensors....
<UmbralRaptop> iximeow: *poof* no more disk space
<iximeow> /dev/sdd1 1.8T 1.7T 25G 99%
<iximeow> oops
* UmbralRaptop didn't do it!
<galois> title: Anne: "This is remarkable: an amateur built a modest arr…" - Beach City
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