raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Fréchet. We currently target 1.5.1, 1.6.1, and 1.7.x. <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly… | <egg> also 4e16 m * 2^-52 is uncomfortably large
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<discord-_> e​gg. — hah
<discord-_> e​gg. — it might be in scope for Principia in a few centuries
<discord-_> S​ir Mortimer. — looks doable
<discord-_> S​ir Mortimer. — if only there wasn't a bug in the duration eval
<discord-_> e​gg. — looks good
<discord-_> e​gg. — > interruptions up to 7 days
<discord-_> e​gg. — pretty sure some admiral is going to want a word about your reliability requirements :-p
<discord-_> e​gg. — we will know where the submarine is before the week is out
<discord-_> S​ir Mortimer. — lol
<discord-_> S​ir Mortimer. — It’s just the first contract. The „hey lets see if this works“ contract, followed by a more difficult one 🙂
<discord-_> e​gg. — :-)
<discord-_> e​gg. — also <3 the german quotation marks :-p
<discord-_> e​gg. — « quotation marks are fun »
<discord-_> S​ir Mortimer. — These? „“
<discord-_> e​gg. — yes
<discord-_> S​ir Mortimer. — Oh i can do "others", or the ones «you’re used to»
<discord-_> S​ir Mortimer. — Or is it »the other way around«
<discord-_> S​ir Mortimer. — I forgot
<discord-_> S​ir Mortimer. — I still need to finish that tundra contract, at least once
<discord-_> S​ir Mortimer. — ^ that's the one for the admirals.
<discord-_> e​gg. — « the french ones are like this »
<discord-_> e​gg. — including spaces
<discord-_> e​gg. — we like spaces : before colons ; semicolons ; and even — dare I say ? — exclamation marks !
<discord-_> e​gg. — hm, I keep forgetting whether TRANSIT was limited to low latitudes or to high ones
<discord-_> e​gg. — (if the former, your arctic station will have trouble :-p)
<discord-_> e​gg. — yeah page 6 of https://www.ion.org/museum/files/TransitBooklet.pdf
<discord-_> e​gg. — I think you can be more lenient than min. 28° (I see 8° in places in the booklet), though there is the question of the max. elevation (if the sat goes right overhead you have high ucertainty cross-track)
<discord-_> S​ir Mortimer. — Overhead the radial speed drops to almost 0, i could use that
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<discord-_> e​gg. — That might work, alternatively set an upper limit on the elevation to count the pass as valid
<discord-_> e​gg. — since that is what the TRANSIT spec uses
<discord-_> e​gg. — 8° to 70° seems to be the typical range
<discord-_> e​gg. — (converting that into min. radial velocities sounds really annoying because it will depend on the planet and the specific orbits, whereas that max. elevation seem sane as a way to measure overheadness)
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<discord-_> e​gg. — TIL (experimentally, and then by looking it up) that PhysX uses a symplectic integrator
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<discord-_> B​utcher. — Makes sense.
<discord-_> B​utcher. — Is that what you expected?
<discord-_> e​gg. — I had overly low expectations I suppose
<discord-_> e​gg. — note that of course a game as a system uses Euler
<discord-_> e​gg. — note that of course a game as a system uses forward Euler (edited)
<discord-_> e​gg. — (because forces applied within the framework of the game are computed from positions at the same time, with a single constant step)
<discord-_> e​gg. — but it seems that within the things handled by the physics engine things are smarter
<discord-_> e​gg. — (in particular rigid body rotation, and likely springs/collisions)
<discord-_> e​gg. — (in particular rigid body rotation, and likely joints//collisions) (edited)
<discord-_> e​gg. — (in particular rigid body rotation, and likely jointscollisions) (edited)
<discord-_> e​gg. — (in particular rigid body rotation, and likely joints/collisions) (edited)