UmbralRaptor 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> … one of the other grad students just compared me to nomal O_o | <ferram4> I shall beat my problems to death with an engineer.
<egg> hm, that forgotten beast in the caverns seem to have some respiratory issues
<egg> maybe I should deal with it at some point
<egg> it did get a few doses of GCS venom, but on larger beasts that's not very effective
<soundnfury> !wpn
* Qboid gives soundnfury an unit
<Iskierka> ...
<egg> !wpn Iskierka
* Qboid gives Iskierka a linear observable with a basilisk attachment
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<UmbralRaptor> egg: how do your dwarves handle copays, deductibles, etc?
<UmbralRaptor> hm
<egg|zzz|egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor a git-rebase
<egg|zzz|egg> zzz
* UmbralRaptor detaches Qboid's head.
* UmbralRaptor should stare at Luna and Jupiter.
<UmbralRaptor> O_o a that cat.
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<UmbralRaptor> Why is the moon smaller in a 40 mm than a 30?
<UmbralRaptor> (the 40 was a 25)
<UmbralRaptor> hrm. seeing is bad for the 10.
* UmbralRaptor should have brought a lunar atlas. And maybe a chair.
<UmbralRaptor> ♃! With balanced moons!
<UmbralRaptor> bands visible w/ 30 mm, but easy w/ 18.
<UmbralRaptor> Polar regions not visible.
<UmbralRaptor> No, go away clouds.
<UmbralRaptor> M13!
<UmbralRaptor> Feh, Lyra's too low down, and the angle's bad for anything in Ursa Major.
* UmbralRaptor did at least get some use from a laser^Wred dot sight pulled off of a cat.
<UmbralRaptor> !wpn egg|zzz|egg
* Qboid gives egg|zzz|egg a radon semigroup
<egg|zzz|egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor an associative 666 timer which vaguely resembles a slug
<UmbralRaptor> !wpn egg|zzz|egg
* Qboid gives egg|zzz|egg a flaming delta goto-like atlatl
<egg|zzz|egg> UmbralRaptor: your eyepiece are long
<UmbralRaptor> I guess?
* UmbralRaptor used 30, 25 (once), 18, 12.7, 10, and 6.4 (unsuccessfully) mm. >_>
<UmbralRaptor> This scope (60 mm ƒ/15) has what, 3x the focal length of yours?
<egg|zzz|egg> UmbralRaptor: it's just that with my tiny scope here they appear long, yeah :-p
<egg|zzz|egg> UmbralRaptor: I do my star-hopping with a 13 mm
<egg|zzz|egg> (the 2.5 mm tends not to be helpful though)
<UmbralRaptor> In terms of useful, it's 30-90x. And, uh, max FOV is like 1.75˚
<UmbralRaptor> If that.
* UmbralRaptor tends to think of ~13 mm as zoomed in. And, well, possibly running out of aperture >_>
<egg|zzz|egg> UmbralRaptor: yeah, with the 13 mm I get 23x :D
<egg|zzz|egg> UmbralRaptor: also Nagler, so 3.36 deg FOV
<egg|zzz|egg> UmbralRaptor: the 2.5 mm is a bit too short even for that scope though, 120x (not an insane magnification, but with the short-focal opticks things get hairy)
<egg|zzz|egg> UmbralRaptor: amusing note: even with the 2.5 mm I can fit a full moon in the field
<UmbralRaptor> @_@
* UmbralRaptor stares at an array of plössls.
<egg|zzz|egg> UmbralRaptor: eventually I should get a cat
<egg|zzz|egg> (and then possibly some longer-focal eyepieces)
<UmbralRaptor> But will you get a cat to look through the cat?
<egg|zzz|egg> UmbralRaptor: are there catadioptric eyepieces
<UmbralRaptor> Uh, some types of cameras and/or spectragraphs?
* UmbralRaptor was leaning more towards the kind of cats that meow.
<egg|zzz|egg> yeah, I got that :-p
<kmath> <jothornely> I do not have the skills required to stop watching this. https://t.co/2x5PPWRFR1
<UmbralRaptor> Pathfinding algorithms might need some work.
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<egg|work|egg> !wpn
* Qboid gives egg|work|egg a RFC 2324-compliant falcon
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<egg|work|egg> !wpn Thomas
* Qboid gives Thomas an antisymmetric purpose
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<egg|work|egg> !wpn hattivat
* Qboid gives hattivat an entangled expectation
<hattivat> o/ egg|work|egg
<hattivat> !wpn egg|work|egg
* Qboid gives egg|work|egg a Balmer ꙮ
<hattivat> O_o
<hattivat> I learned something linguistics-related from Qboid, kudos for whoever found this gem
<egg|work|egg> it is a good letter
<egg|work|egg> I do like Ꙭ for the dual of eyes too
<hattivat> cool stuff
<egg|work|egg> hattivat: s/O_o/Ꙩ_ꙩ/
<Qboid> egg|work|egg thinks hattivat meant to say: Ꙩ_ꙩ
<hattivat> :D
* egg|work|egg heads home
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<UmbralRaptor> =(
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<Ellied> !wpn egg|work|egg
* Qboid gives egg|work|egg a ?
<Ellied> egg|work|egg: enjoy your
<egg|afk|egg> Ellied: snek!
<Ellied> oh, is that a character that didn't render on my end
<UmbralRaptor> !u ?
<Qboid> U+1F40D SNAKE (?)
<Ellied> hunf.
<Ellied> all my devices have font problems lately. my phone renders a steadily increasing bunch of characters as X-boxes
<UmbralRaptor> Tofu! /o\
<hattivat> s/O_o/᳀_᳂
<Qboid> hattivat meant to say: ᳀_᳂
<hattivat> that's in cool Old Sundanese, but I can't get my terminal to display it properly :<
<UmbralRaptor> !u ᳀_᳂
<Qboid> U+1CC0 SUNDANESE PUNCTUATION BINDU SURYA (᳀)
<Qboid> U+005F LOW LINE (_)
<Qboid> U+1CC2 SUNDANESE PUNCTUATION BINDU PURNAMA (᳂)
<hattivat> the first one is simply a special sign for the Sun
<hattivat> and the other is for full moon
<hattivat> it's interesting that they exist, because Sundanese script is generally not ideographic
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<egg|afk|egg> ecce σ
<Sigma88> 0/
<egg|afk|egg> > bits (0.6 * (2^54))
* egg|afk|egg pokes Soozee with a stick
<egg|afk|egg> > (0.6 * (2^54))
<Soozee> 1.080863910568919e16
<egg|afk|egg> ah yes
<egg|afk|egg> > bits (round (0.6 * (2^54)))
<Soozee> [1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0,0,1,1,0...
<Sigma88> I'm still not sure what all this has to do with my issue :D
<egg|afk|egg> > printbits (round (0.6 * (2^54)))
<egg|afk|egg> Sigma88: anyway, I forget how I wrote that, but these are the first few bits of 0.6
<Sigma88> ok
<egg|afk|egg> Sigma88: so you can see that it's 1.0011001100110011... * 2^something
<Sigma88> ok
<egg|afk|egg> Sigma88: so that's going to get rounded to 53 bits, and the result of that is the number that you will actually be dealing with
<Sigma88> ok
<egg|afk|egg> Sigma88: now if you used Decimal floating point, 0.6 would be representable (but 1/3 still wouln't be)
<Sigma88> all this makes sense
<egg|afk|egg> Sigma88: but let's not go there, that doesn't help
<egg|afk|egg> Sigma88: so back to the problem at hand: you have the number of seconds in a year in double, and the number of seconds in a day in double, right?
<Sigma88> "Decimal floating point" is that a type of number?
<Sigma88> like "double"
<Sigma88> right
<egg|afk|egg> Sigma88: it's a thing, C# does have it, it's called Decimal
<Sigma88> ah ok
<Sigma88> but yes, year in double and day in double
<egg|afk|egg> but you don't actually need that, because you don't really care whether 0.6 is representable
<egg|afk|egg> Sigma88: ok, and then you want to return a year number which is an integer, a day number which is an integer, and you want there to be leap days so that over the long run the length of the year approximates the true length of year
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<Sigma88> well, how I do it right now is
<egg|afk|egg> the question isn't what you do, it's what you want :-p
<Sigma88> ok
<Sigma88> so, I want the year to end at the last full day
<Sigma88> so if 0.25 days are left, the next year starts
<Sigma88> at the end of that year will remain 0.5 days
<Sigma88> (0.25 from the first and 0.25 from the second)
<egg|afk|egg> ok, I see what you mean
<Sigma88> third year 0.75
<Sigma88> fourth year LEAP DAY!
<Sigma88> \0/
<Sigma88> so in 400 years, new year's day is still on the same side of the sun
<egg|afk|egg> Sigma88: but do note that if you're using the Gregorian calendar, that one is based on a year length of 365.2425 (it's not the Julian calendar)
<Sigma88> I'm not using a calendar
<egg|afk|egg> I know
<Sigma88> I am defining a calendar
<egg|afk|egg> yes
<egg|afk|egg> I understand that
<egg|afk|egg> but underlying the calendar you define is a year length
<egg|afk|egg> it is the same thing for the Gregorian calendar
<Sigma88> if I wanted to use the real life calendar I would have used the Time functions :D
<egg|afk|egg> Sigma88, ascolta!
<Sigma88> sure
<egg|afk|egg> it is the same thing for the Gregorian calendar, that's how you get the 100 years 400 years thing
<egg|afk|egg> it's basically using the same algorithm
<egg|afk|egg> Iskierka: dinosaur!
<Sigma88> lol
<egg|afk|egg> Sigma88: but it uses a year length of 365.2425
<Sigma88> sure
<Sigma88> I got what you meant
<Sigma88> I always used 365.25 to test but I could have used 365.2425
<Sigma88> to be honest, I think I might just use int for day and year
<egg|afk|egg> no, that's silly
<egg|afk|egg> because then they'll get out of sync very quickly
<egg|afk|egg> (with the astronomical values)
<Sigma88> int seconds
<Sigma88> just to load the values
<egg|afk|egg> Sigma88: again, there's no point!
<egg|afk|egg> just use double-precision floating point, it's all you need
<egg|afk|egg> > map (\n -> truncate (365.2425 * n - 365 * n)) [0..]
<Soozee> [0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,8,8,8,8,8...
<egg|afk|egg> Sigma88: so, here's a cumulative number of leap days for each year ^
<Sigma88> there are 5 years without 1?
<egg|afk|egg> yes
<egg|afk|egg> .2425
<egg|afk|egg> Gregorian calendar
<Sigma88> right
<egg|afk|egg> Sigma88: now, the issue with using truncation as you are doing is that if the year length is say 365.000001, the one-in-a-million missing leap year is going to be visible, because it's the first thing that happens
<egg|afk|egg> Sigma88: if you rounded, instead of truncating, it would happen half a million years in and nobody would ever see it
<egg|afk|egg> (because iirc bits of the game still break long before that)
<Sigma88> not sure about that
<Iskierka> could truncate the other side and only add a whole day when there's one going spare
<Sigma88> I can go backwards in time 65 million years in one of my mods
<egg|afk|egg> Iskierka: that is also a possibility, but then there's the case where you have 364.999999999 days per year
<Iskierka> true
<egg|afk|egg> Sigma88: but anyway, you don't really care about a one in a million leap year
<Sigma88> yup
<Iskierka> solution: start in year 1
<Iskierka> to cancel the first error flip
<Sigma88> I can do that
<egg|afk|egg> Sigma88: and even that's too big actually, 1 double ULP is tiny
<Sigma88> I have an offset value available
<egg|afk|egg> ;rpn 365 2 -53 ^ *
<kmath> egg|afk|egg: 4.0523140398818214e-14
<Sigma88> oh god what's that?
<egg|afk|egg> Sigma88: when you have a rounding error, that's how often it will round the leap year
<egg|afk|egg> s/round /change
<Qboid> egg|afk|egg meant to say: Sigma88: when you have a rounding error, that's how often it will change the leap year
<Iskierka> double is a 53 bit int with separate sign and exponent
<egg|afk|egg> ;rpn 1 365 2 -53 ^ * /
<kmath> egg|afk|egg: 24677258232167.1
<Iskierka> and 53 is a lot of bits
<egg|afk|egg> Sigma88: once every 24677258232167 years or so
<Sigma88> ok
<egg|afk|egg> aka, you don't care :-p
<Iskierka> 53-bit time will get you 285 megayears before the precision is above seconds
<egg|afk|egg> now if you truncate one way or another, you'll put that extra leap year right at the start, which screws things up
<Sigma88> so I'm a bit confused about what you are suggesting I would do
<egg|afk|egg> Iskierka's suggestion seems good
<egg|afk|egg> alternatively, use rounding instead of truncation
<Sigma88> round what?
<egg|afk|egg> > map (\n -> truncate (365.2425 * n - 365 * n)) [0..]
<Soozee> [0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,8,8,8,8,8...
<egg|afk|egg> > map (\n -> round (365.2425 * n - 365 * n)) [0..]
<Soozee> [0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,8,8,8,8,8,9,9...
<egg|afk|egg> > map (\n -> round (365.2425 * n - 365 * n)) [-2..]
<Soozee> [0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,8,8,8,8,8...
<Sigma88> ok I got that
<egg|afk|egg> uh
* egg|afk|egg poke Soozee with sticks
<Sigma88> but I don't understand what I need to do to get that map
<Sigma88> could you explain the function you are using?
<egg|afk|egg> Sigma88: essentially what you're saying is "start the new year if there's a full extra day"
<egg|afk|egg> Sigma88: what I'm saying is "start the new year is there's half a day"
<Sigma88> thanks
<Sigma88> >= 0.5 or > 0.5
<egg|afk|egg> doesn't really matter?
<Iskierka> https://i.imgur.com/KY9gC2O.jpg a time machine and old weather data could be really profitable
<Sigma88> ok egg so I try with your suggestion
<Sigma88> see what happens
<Sigma88> man my english sucks
<Sigma88> egg I also have another option in my calendar
<Sigma88> I'd like to hear your suggestions about that as well
<Sigma88> basically, the year ends when it has to end
<Sigma88> but the first day of the following year starts at the end of the last day of the year that just ended
<egg|afk|egg> how is that different from the truncation scheme
<Sigma88> so you go, ... > Y1D365 > Y1D366 (for 0.25 days) > Y2D0 (for 0.75days) > Y2D1 > ....
<egg|afk|egg> ah ok
<egg|afk|egg> Sigma88: well, that means that there's no ambiguous date for "today", so that irks me
<egg|afk|egg> also it has the same issues as the truncation method
<Sigma88> yeah I like the leap date better as well
<Sigma88> but that's closer to the stock clock
<egg|afk|egg> meh
<egg|afk|egg> if you're defining a calendar, make it a calendar
<Sigma88> :)
<egg|afk|egg> not something where "what's today's date" doesn't have a single answer
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<egg|cell|egg> Wait these schemes don't give Gregorian style rules
<egg|cell|egg> They give strange sequences of leap years
<egg|cell|egg> You should use continued fractions probably
<egg|cell|egg> But zzz
<Sigma88> haha night egg
<Sigma88> thanks for the help
<Sigma88> I'll try and see what happens
<egg|cell|egg> Sigma: i will poke you tomorrow with a better scheme
<Sigma88> ok thanks
<Sigma88> <3
<egg|cell|egg> Live cat https://youtu.be/3rBf_p6mTtA
<kmath> YouTube - Little live teardown of NTSC test pattern Tek @scanlime-in-progress
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<UmbralRaptor> Kitties!
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