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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<_whitenotifier-5dfc> [Principia] fat-lobyte opened issue #2237: Subsurface trajectory on Phobos ends in Collision - https://git.io/fjis8
<_whitenotifier-5dfc> [Principia] pleroy opened pull request #2238: Simple argument reduction for elliptic integrals - https://git.io/fjis4
<_whitenotifier-5dfc> [Principia] fat-lobyte edited issue #2237: Trajectory above surface on Phobos ends in Collision - https://git.io/fjis8
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<_whitenotifier-5dfc> [Principia] eggrobin labeled pull request #2238: Simple argument reduction for elliptic integrals - https://git.io/fjis4
<_whitenotifier-5dfc> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/3734/
<_whitenotifier-5dfc> [Principia] pleroy closed pull request #2238: Simple argument reduction for elliptic integrals - https://git.io/fjis4
<_whitenotifier-5dfc> [Principia] pleroy pushed 6 commits to master [+0/-0/±14] https://git.io/fjisP
<_whitenotifier-5dfc> [Principia] pleroy 246142a - New tests and an implementation that fails miserably.
<_whitenotifier-5dfc> [Principia] pleroy 6f2c364 - Test passes for positive angles.
<_whitenotifier-5dfc> [Principia] pleroy aeb4ae8 - Tests passing.
<_whitenotifier-5dfc> [Principia] ... and 3 more commits.
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<egg|zzz|egg> mofh: meow
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<egg|zzz|egg> !wpn mofh
* galois gives mofh a superluminal cormorant
<egg|zzz|egg> !wpn whitequark
* galois gives whitequark a flyswatter with a sword attachment
<mofh> !wpn egg|zzz|egg
* galois gives egg|zzz|egg a owl with a knife attachment
<UmbralRaptop> Those are talons, galois
<_whitenotifier-5dfc> [Principia] scimas opened issue #2239: The tolerance and steps settings are not presereved across scene changes - https://git.io/fjinj
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<UmbralRaptor> !8 Is the purpose of the qualifying exams to make sure that there aren't too many academics?
<galois> UmbralRaptor: yes
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<whitequark> !wpn egg
* galois gives egg a woomera
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<egg|zzz|egg> mofh: meow
<mofh> egg|zzz|egg: meow
<mofh> I think I forgot some BBDs at ANBO last time, oups
<mofh> (MN3007s, analog delay line ICs)
<egg|zzz|egg> mofh: I wonder whether I forgot my shirt with geckos on it
<egg|zzz|egg> if so i wonder where
<mofh> I don't seem to recall you wearing that one last time? Not sure, at least.
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<egg|zzz|egg> Метеор-3 №7
<egg|zzz|egg> mofh: whitequark: I am very confused by the fact that № is specifically for cyrillic use (+CJK compat but let's ignore deprecated uses)
<whitequark> yeah I dunno
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* egg|zzz|egg scritches whitequark
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<whitequark> henlo
<egg|zzz|egg> ADEOS?
<galois> ADEOS: ADvanced Earth Observing Satellite
<egg|zzz|egg> ICESat?
<galois> ICESat: Ice, Cloud,and land Elevation Satellite
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<mofh> er wrong window
<_whitenotifier-5dfc> [Principia] eggrobin opened pull request #2240: Orbit recurrence - https://git.io/fjiW7
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<_whitenotifier-5dfc> [Principia] eggrobin synchronize pull request #2240: Orbit recurrence - https://git.io/fjiW7
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<egg|zzz|egg> 福爾摩沙衛星二號
<mofh> egg|zzz|egg: oh hey so Capderou's recurrence triple is basically division constants for a fractional-N PLL
<egg|zzz|egg> PLL?
* egg|zzz|egg looks that up and gets https://fr.wikipedia.org/wiki/Pretty_Little_Liars
<galois> [WIKIPEDIA] Pretty Little Liars | "Pretty Little Liars, ou Les Menteuses au Québec, est une série télévisée américaine en 160 épisodes d'environ 44 minutes, développée par I. Marlene King et diffusée entre le 8 juin 2010 et le 27 juin 2017 sur ABC Family/Freeform et en simultané au Canada sur MuchMore/M3 pour les six premières saisons..."
<mofh> Phase-Locked Loop >_>
<mofh> basically a Proportional-Integral control loop that takes as input phase errors/phase offsets and outputs frequency corrections.
<egg|zzz|egg> il dit qu'il n'a pas de genou
<mofh> ???
<egg|zzz|egg> (reference to La cité de la peur)
<egg|zzz|egg> mofh: the next line in that movie is "il dit qu'il voit pas le rapport"
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<egg|zzz|egg> mofh: I mean, this is just expressing a rational as integer part + fractional part (with the mild quirk of the integer part being by rounding to nearest instead of directed rounding), I'm sure this is done everywhere but I'm not sure how PLLs are especially relevant
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<_whitenotifier-5dfc> [Principia] eggrobin synchronize pull request #2240: Orbit recurrence - https://git.io/fjiW7
<mofh> egg|zzz|egg: I mean offhand I don't think it has any special meaning, that's just the main place I see that used in frequency recurrence.
<mofh> Like I do want to take a closer look now.
<egg|zzz|egg> mofh: also Capderou is a bit weird when it comes to notation
<egg|zzz|egg> the sub-cycle, Eᴛₒ*
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<mofh> Yeah I was wondering what the hell that was.
<egg|zzz|egg> mofh: it's the best plain-text rendition I can find for E_{T_o}
<egg|zzz|egg> mofh: the main advantage of expressing Nᴛₒ / Cᴛₒ as νₒ + Dᴛₒ / Cᴛₒ is that νₒ is roughly the number of orbits per day, which is a nice tangible quantity
<egg|zzz|egg> mofh: Dᴛₒ is mildly useful, but in practice only when it comes to computing Eᴛₒ* which is the thing you care about
<egg|zzz|egg> mofh: also Capderou rants about people in the literature who confuse Eᴛₒ* and Dᴛₒ because they happen to be the same for a few common orbits (esp. the SPOT one)
<egg|zzz|egg> (in a bunch of other cases it's the same up to sign, further confusing things)
<mofh> Wait, under what circumstance would they be the same but opposite in sign?!
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<egg|zzz|egg> mofh: Terra, TOPEX/Poséidon
<mofh> wait, TOPEX/Poséidon does that? Huh.
<egg|zzz|egg> mofh: I mean, Eᴛₒ* is positive by definition, and Dᴛₒ isn't, so
<egg|zzz|egg> (and then Eᴛₒ* is the least Eᴛₒ such that Eᴛₒ Dᴛₒ ≡ ±1 (mod Cᴛₒ))
<mofh> Ah.
<egg|zzz|egg> mofh: actually i'm mildly confused as to what the exact number of revolutions is for one subcycle
<egg|zzz|egg> it's going to be close to νₒ Eᴛₒ* obviously, but then you need to wait long enough that you are back into the base interval
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