raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Galileo. We currently target 1.5.1, 1.6.1, 1.7.x, 1.8.1, and 1.9.1. <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
egg|cell|egg has joined #principia
egg|anbo|egg has joined #principia
egg|cell|egg has quit [Ping timeout: 378 seconds]
egg|cell|egg has joined #principia
Wetmelon has joined #principia
egg|anbo|egg has quit [Remote host closed the connection]
<discord->
Kerbinator. — Well
<discord->
Kerbinator. — still
<discord->
Kerbinator. — long-time logging of planets can lag the game
<discord->
Kerbinator. — Even just at 2000+ (50+ years after game-start)
<discord->
egg. — Yes, this has been discussed at length already
egg|anbo|egg has quit [Remote host closed the connection]
<discord->
Zeusbeer. — Mhm, I'd really like the ability to change starting dates, I'd like to try MESSENGERS flight plan for a manned mission to mercury
<discord->
Zeusbeer. — But it's launched early 2000s so loading times will have a stroke
<discord->
Anomaly. — MESSENGER took its sweet time. Not a good idea for crewed.
<discord->
Anomaly. — I don't think crewed Mercury is a good idea in general.
<discord->
Zeusbeer. — Loll im just smurff plus rss
<discord->
Zeusbeer. — No lifesupport needed
<discord->
Zeusbeer. — I Just want to have a KeRbAl plant a flag
Blu3wolf has joined #principia
<discord->
Zeusbeer. — wait, wouldn't it be possible to have all the planet positions for like every 10 years so you can select a starting date when you create a new ksp world?
<discord->
Zeusbeer. — from like 1950-1960-1970-1980-1990-2000
egg|anbo|egg has joined #principia
<_whitenotifier-9244>
[Principia] eggrobin closed pull request #2654: Accept other Visual Studio versions, except when releasing - https://git.io/JJ8FX
<_whitenotifier-9244>
[Principia] eggrobin pushed 7 commits to master [+0/-0/±9] https://git.io/JJBTk
<_whitenotifier-9244>
[Principia] eggrobin 014a439 - accept other Visual Studio versions except when releasing
<_whitenotifier-9244>
[Principia] eggrobin f6c7ebf - list available versions
<discord->
egg. — @Zeusbeer you don’t need to tell me that you would like this feature every day, I get the idea
<discord->
egg. — As I have repeatedly said already, this is possible with `game_epoch` except for a performance problem, and the performance should solve itself as part of our current effort on 2400
<discord->
egg. — As I have repeatedly said already, this is possible with `game_epoch` except for a performance problem, and the performance problem should solve itself as part of our current effort on 2400 (edited)
<discord->
egg. — And again, as I pointed out, if you really want something fast in the meantime, you can use a config with a later initial state, which you can generate at a selection of dates from what lies in the `astronomy` directory of Principia, using the Principia `tools`.
egg|anbo|egg has quit [Remote host closed the connection]
egg|anbo|egg has quit [Remote host closed the connection]
egg|cell|egg has joined #principia
<discord->
lamont. — so @egg what drives the requirements for having the time derivative of the coordinate transformation?
<discord->
egg. — Ooh right I forgot to eggsplain
<discord->
lamont. — 🙂
<discord->
lamont. — i was super tired yesterday anyway....
egg|anbo|egg has joined #principia
<discord->
egg. — so, in a sense, (position, velocity) is a very fundamental tuple
<discord->
egg. — much more so than (position, velocity, acceleration)
<discord->
egg. — because with position and velocity give you the initial state (they are the phase space, in Lagrangian/Hamiltonian terminology)
<discord->
egg. — because position and velocity give you the initial state (they are the phase space, in Lagrangian/Hamiltonian terminology) (edited)
<discord->
lamont. — yep yep
<discord->
egg. — so this entity (`DegreesOfFreedom` in Principia API words) is very often the one that you want to be transforming
<discord->
egg. — and similarly with respect to physical properties of reference frame, the important stuff is at the first-derivative level too
<discord->
lamont. — so you need the first derivative to transform velocity?
<discord->
egg. — yup, because the RigidTranformation transforms Positions, the RigidMotion (its derivative, an element of the tangent bundle of rigid transformations if you feel fancy) transforms DegreesOfFreedom (a Position and a Velocity, an element of the tangent bundle of positions)
<discord->
egg. — @lamont as an example, your velocity with respect to the inertial frame centred at the solar system barycentre can be decomposed into :
<discord->
egg. — - your velocity with respect to the surface of the Earth,
<discord->
egg. — - the velocity of the surface of the Earth where you are (the angular velocity of the surface frame comes into that),
<discord->
egg. — - the velocity of the geocenter
<discord->
egg. — @lamont as an example, your velocity with respect to the inertial frame centred at the solar system barycentre can be decomposed into :
<discord->
egg. — - your velocity with respect to the surface of the Earth,
<discord->
egg. — - the velocity of the surface of the Earth where you are (the angular velocity of the surface frame comes into that),
<discord->
egg. — - the velocity of the geocenter in the SSB frame (edited)
<discord->
lamont. — yep
egg|anbo|egg has quit [Remote host closed the connection]
egg|cell|egg has quit [Read error: Connection reset by peer]
egg|cell|egg has joined #principia
egg|anbo|egg has joined #principia
egg|anbo|egg has quit [Remote host closed the connection]
egg|anbo|egg has joined #principia
egg|anbo|egg___ has quit [Ping timeout: 189 seconds]
Blu3wolf has quit [Quit: Konversation terminated!]
egg|anbo|egg_ has joined #principia
Wetmelon has quit [Ping timeout: 189 seconds]
<discord->
Zeusbeer. — Anyone knows if Dawn would be hard to recreate?
<discord->
Zeusbeer. — actually, considering it uses ion propulsion, it shouldn't be too hard, just force the manouvers you want to do
<discord->
Zeusbeer. — actually, considering it uses ion propulsion, it shouldn't be too hard, just bruteforce the manouvers you want to do (edited)
egg|anbo|egg_ has quit [Remote host closed the connection]
egg|anbo|egg_ has joined #principia
Jesin has joined #principia
<discord->
egg. — yup, because the RigidTranformation transforms Positions, the RigidMotion (its derivative, an element of the tangent bundle of the space of rigid transformations if you feel fancy) transforms DegreesOfFreedom (a Position and a Velocity, an element of the tangent bundle of the space of positions) (edited)
<discord->
Anomaly. — > The Dawn spacecraft spent half of its journey with the engine on.
<discord->
Anomaly. — Yeah, nah.
<discord->
Anomaly. — The Dawn spacecraft spent half of its journey with the engine on. (edited)
egg|anbo|egg_ has quit [Remote host closed the connection]