Perl 6 - the future is here, just unevenly distributed

IRC log for #rosettacode, 2012-11-24

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All times shown according to UTC.

Time Nick Message
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01:28 BenBE Hi, any astronomer here?
01:28 * BenBE is wondering what the galactic coordinates of Earth are (given a specific date).
01:30 sorear I'm not one, but I think professional astronomers almost always use geocentric coordinates
01:33 sorear The galactic coordinate system is a celestial coordinate system in spherical coordinates, with the Sun as its center, a primary direction aligned with the approximate center of the Milky Way galaxy, and a fundamental plane approximately in the galactic plane. It has a right-handed convention, meaning that coordinates are positive toward the north and toward the east in the fundamental plane.[1]
01:33 sorear so, to within an astronomically insignifcant error margin, the Earth's coordinates are (0,0,0) :D
01:33 sorear like 10^-5 pc
01:38 BenBE Well, let l be 8.5 light-minutes ... now how to get a and b gven a date?
01:39 TimToady this will cause trouble when we hit other galactic civilizations.  we should choose the origin at the center, and then we only have to change the prime meridian to translate to someone else's galactic system...well, and maybe the chirality...
01:40 TimToady I almost said "handedness", but that's assuming hands rather than, say, tentacles...
01:41 TimToady well, and I suppose they may measure meters differently :)
01:41 BenBE It's defined physically ;-)
01:42 TimToady it's not the physicality of the definition that is the problem, but the numeric bits
01:42 BenBE ;-)
01:43 TimToady obviously we should define length in terms of the size of the galaxy itself, and now we can argue over pi vs tau :)
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01:43 BenBE But well, How would I go along IF I wanted to get the Galactic Coords of Earth say at 1st Jan 1970 ...
01:44 TimToady well, seconds are also define physically :)
01:44 BenBE (Assuming using VERY high precision and not rounding to zero)
01:46 TimToady coordinating everyone's galactic clocks is just a small matter of general relativity
01:47 BenBE Let's assume a static snapshop of our universe with everything in sync ;-)
01:49 sorear TimToady: I don't think chiron is much of an improvement of handed ...
01:54 BenBE No ideas or productive hints?
01:58 sorear BenBE: it's gotta be pretty close to a sinsoid
01:59 sorear https://en.wikipedia.org/wiki/Galactic_coordinates has a conversion chart for turning "equatorial coordinates" relative to the Sun into Galactic coords
01:59 fedaykin "Galactic coordinate system - Wikipedia, the free encyclopedia" http://rldn.net/stnm
02:00 sorear "equatorial" coords of the Earth relative to the Sun are simply the negation of the true equatorial coordinates of the Sun (wrt the Earth, as true eq. coords always are)
02:01 sorear calculating the coordinates of the Sun sounds like something you could ask an astrologer about
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03:13 opticron *astronomer
03:13 opticron also, what jackass decided the sun was going to be the center of the galactic lat/lon system?
03:14 sorear opticron: the location of the sun in equatorial coordinates determines the current zodiac sign.  I think it is far more important to astrologers than astronomers
03:14 opticron heh
03:15 * opticron is just irritated because his SW:TOR server went down just now
03:16 sorear one you run, or one you prefer to use?
03:17 opticron they're all origin/bioware controlled
03:17 opticron and I pay to use them
03:17 opticron if I wasn't paying, I'd be more meh about it
03:18 sorear I see
03:18 sorear so your subscription is only good on a specific server?
03:18 opticron no, good on all of them, but accounts aren't available on all servers
03:19 opticron just on the one where you created it
03:19 sorear I can sort of see the logic behind putting the Earth at the center
03:19 sorear You need entirely different techniques to measure distance as opposed to apparent position
03:20 opticron it makes sense in the short to medium term
03:20 sorear so in general the distance and position terms will have different error terms
03:20 opticron right
03:20 opticron because we'll be expanding outward from sol in the coming millinea
03:20 opticron millenia?
03:24 sorear I like millenia better
03:25 TimToady probably not till we perfect cryostasis, if it's really to be "we"
03:25 TimToady at least it's pretty easy to keep us frozen out in deep space, but radiation is still kind of ferocioius
03:26 TimToady *cious
03:26 TimToady especially going any significant fraction of c
03:26 sorear I would prefer not to expand out from Sol
03:26 sorear I would prefer to keep my maximum dimension below 2m or so
03:26 TimToady we !eqv I
03:27 TimToady solipsists excluded
03:30 TimToady unfortunately, the only current technique for controlling radiation damage is to *not* freeze ourselves, but to send generation ships where cross-breeding can select for healthier genomes
03:31 sorear keeping people frozen is pretty easy, we've been doing it... to the same people... for tens of millenia
03:31 sorear thawing them, a bit trickier
03:32 sorear what kind of significant fractions of c are we talking about here?
03:32 TimToady thawing them would be a lot easier if we didn't freeze them badly
03:32 TimToady how many thumps of the Orion Drive am I allowed?
03:33 opticron all of them!
03:33 TimToady but practically, probably not a large fraction unless someone invents cheap antimatter
03:34 TimToady in which case, we'd darn well better spread out a bit
03:34 opticron yeah....exploding all of humanity in one go might not be the best idea
03:37 sorear orion drive's probably not going anywhere as long as people remain fond of diverting explosives for use on each other
03:41 opticron but they work so well for that...
03:43 * sorear is irritated that we don't even have settlements on any(Moon,Venus,Mars)
03:47 opticron lol, venus will be a fun one
03:49 opticron anyone heard whatever it was they found on mars?
03:49 opticron all I know is that they seem to have found something that they're keeping hush hush
03:49 opticron haven't really looked into it
03:51 sorear opticron: it's going to be announced at the fall meeting of the international geophysical union dec 3-7
03:52 sorear venus is a surprisingly nice planet
03:57 TimToady AC bills are a bit high though
04:01 sorear also mining is very tricky
04:04 TimToady easiest way to mine venus would be to put a metallic asteroid in orbit around it.  :)
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