02:33 <discord-> K​erbinator. — oh my

02:33 <discord-> K​erbinator. — https://cdn.discordapp.com/attachments/480397772248580098/778810168321638410/GIAGKMPZEFAXOEQ.jpg

02:33 <discord-> K​erbinator. — well we are probably in some trouble

02:34 <discord-> K​erbinator. — as reachstar is now cooperating with The popular science of China (official) to make a CG of Chang'e 5 in KSP

02:35 <discord-> K​erbinator. — and the problem since that now it seems the lags are causing trouble

02:35 <discord-> K​erbinator. — (for the CG you have to tune the game to 2020)

02:38 <discord-> K​erbinator. — well in my opinion accumulative lag (e.g. the total in-game time passed, or the reverts you have made)

02:39 <discord-> K​erbinator. — as reachstar is now cooperating with The popular science of China (official) to make a CG of Chang'e 5 in KSP

02:39 <discord-> K​erbinator. — (with official work it needs to be good) (edited)

02:39 <discord-> e​gg. — @Reach I think you’ll want a custom initial state config that puts the beginning of the game in 2020

02:39 <discord-> K​erbinator. — oh IDK whether that is reachstar???

02:39 <discord-> e​gg. — yes

02:40 <discord-> e​gg. — @lpg I think you had prepared some custom initial states every 5 years or so?

02:40 <discord-> e​gg. — alternatively I could make one

02:41 <discord-> l​pg. — not me

02:41 <discord-> e​gg. — hm

02:43 <discord-> s​cimas. — That's me, https://drive.google.com/drive/folders/1iNlip4K66oaOQgPm7nDnpQxExuDmp6lu?usp=sharing . You'll want to use the 2015 state and timewarp to 2020.

02:44 <discord-> K​erbinator. — well accumulative lag is a bit strange

02:44 <discord-> K​erbinator. — 👀

02:45 <discord-> s​cimas. — I've also included the RSSTimeFormatter MM patch in there now so that the date reads correctly in game.

02:46 <discord-> e​gg. — how did you generate them, with the batch query by email and the awk postprocessor dance ?

02:47 <discord-> s​cimas. — I don't remember exactly. But I think I got the states through telnet, copy pasted them into a single CSV, and then wrote a script to separate them into Principia intial state config files.

02:48 <discord-> K​erbinator. — I think you can use some "save-epoch" tech for Principia , egg

02:48 <discord-> K​erbinator. — IDK whether this will help

02:48 <discord-> K​erbinator. — I think you can use some "save-epoch" tech for Principia (edited)

02:49 <discord-> e​gg. — Kerbinator, I know how to do this, that’s how you have RSS support to start with…

02:49 <discord-> K​erbinator. — I'm downloading the epoch and send it to reachstar lol

02:50 <discord-> K​erbinator. — as a temporary fix

02:50 <discord-> K​erbinator. — his VPN sucks

02:50 <discord-> K​erbinator. — his VPN sucks now (edited)

02:51 <discord-> K​erbinator. — Sent.

02:51 <discord-> K​erbinator. — Sent. Epoch for 2015. (edited)

02:52 <discord-> e​gg. — @scimas that works, you end up essentially writing the same scripts we wrote; the main advantage of the email query over the telnet stuff is that it’s easier to get the settings right

02:53 <discord-> K​erbinator. — however real epoch is different from 1950-calculated epoch lol

02:53 <discord-> K​erbinator. — real epoch considers relativity effects, solar pressure etc.

02:54 <discord-> s​cimas. — I think the telnet interface also save the settings and ultimately I got the data through emails anyway. The reason I didn't use your awk scripts is my awk-fu is not strong enough to understand the whole thing. And I had an itch to write some program at the time anyway....

02:54 <discord-> e​gg. — @Kerbinator I think you mean "state" (as in, where things are), "epoch" just means "point in time".

02:55 <discord-> s​cimas. — I think the telnet interface also saves the settings and ultimately I got the data through emails anyway. The reason I didn't use your awk scripts is my awk-fu is not strong enough to understand the whole thing. And I had an itch to write some program at the time anyway.... (edited)

02:56 <discord-> e​gg. — but yes, propagating all the way from 1950 will give you small errors. Nothing visible as far as the Earth-moon system is concerned though: the recent solar eclipse over the US worked just fine for instance.

02:57 <discord-> e​gg. — @scimas the email interface is horrible in that it sends you one email per body though

02:57 <discord-> K​erbinator. — yes

02:58 <discord-> s​cimas. — Yup, manual copy paste from 14-15 emails (or however bodies are in RSS) is a fun process 🙂

02:58 <discord-> s​cimas. — Yup, manual copy paste from 14-15 emails (or however many bodies are in RSS) is a fun process 🙂 (edited)

02:58 <discord-> K​erbinator. — I think a thing for principia is to cancel out accumulative lag, such as time-related, or revert-related

02:58 <discord-> e​gg. — 34 emails

02:59 <discord-> K​erbinator. — I have some of my KSP friends reporting accumulative lags from reverted vessels

02:59 <discord-> K​erbinator. — revert to VAB or SPH cause increase in lags

02:59 <discord-> e​gg. — @Kerbinator, you don’t need to tell us about scene change lag buildup, we have literally been working on that for the past year

02:59 <discord-> e​gg. — We know about it

02:59 <discord-> K​erbinator. — ok

03:00 <discord-> K​erbinator. — *for the later launched vessels after the revert

03:00 <discord-> K​erbinator. — not scene change itself (?)

03:20 <discord-> e​gg. — ah their format subtly changed and broke our awk

03:34 <discord-> e​gg. — for 2020-01-01T00:00:00:00.000864

03:34 <discord-> e​gg. — https://cdn.discordapp.com/attachments/480397772248580098/778825620146487326/sol_initial_state_jd_2458849_500000010.cfg

03:35 <discord-> e​gg. — (not sure why Horizons didn’t want to give me a point at JD2458849.5…)

03:37 <discord-> e​gg. — to be honest 2020 might not be ideal because you won’t get past planet histories, it may look weird. You’re probably better off with scimas’s 2015 file (which starts you off in 2016).

03:37 <discord-> e​gg. — for 2020-01-01T00:00:00.000864 (edited)

03:37 <discord-> e​gg. — https://cdn.discordapp.com/attachments/480397772248580098/778825620146487326/sol_initial_state_jd_2458849_500000010.cfg

03:39 <discord-> K​erbinator. — okay

03:40 <discord-> e​gg. — the main concern there is whether scimas got all the options right

03:42 <discord-> e​gg. — @Kerbinator ask Reach whether https://webchat.esper.net/ (channel #principia) works for him or whether he runs into ladder issues there too

03:49 <discord-> s​cimas. — @egg You could cross check the positions of a couple of bodies for the single year in their web interface. And if I got those right, everything should be right, since it's same settings for everything. Off the top of my head, it was solar system barycenter as the origin and Earth's equator as the reference plane, the rest was making sure I don't select individual system barycenters and select the a

03:50 <discord-> e​gg. — yeah, alternatively if you still have the emails the headers should list everything and I can cross-check that against my emails

03:51 <discord-> s​cimas. — Do you want all of the headers or a single header is fine?

03:51 <discord-> e​gg. — a single header please, let’s not completely spam the chat  :D

03:51 <discord-> s​cimas. — ```

03:51 <discord-> s​cimas. — Target body name: Europa (502) {source: jup357_merged}

03:51 <discord-> s​cimas. — Center body name: Solar System Barycenter (0) {source: DE431mx}

03:51 <discord-> s​cimas. — Center-site name: BODY CENTER

03:51 <discord-> s​cimas. — *******************************************************************************

03:51 <discord-> s​cimas. — Start time : A.D. 1950-Jan-01 00:00:00.0000 TDB

03:51 <discord-> s​cimas. — Stop time : A.D. 2021-Jan-01 00:00:00.0000 TDB

03:51 <discord-> s​cimas. — Step-size : 5 calendar years

03:52 <discord-> s​cimas. — *******************************************************************************

03:52 <discord-> s​cimas. — Center geodetic : 0.00000000,0.00000000,0.0000000 {E-lon(deg),Lat(deg),Alt(km)}

03:52 <discord-> s​cimas. — Center cylindric: 0.00000000,0.00000000,0.0000000 {E-lon(deg),Dxy(km),Dz(km)}

03:52 <discord-> s​cimas. — Center radii : (undefined)

03:52 <discord-> s​cimas. — Small perturbers: Yes {source: SB431-N16}

03:52 <discord-> s​cimas. — Output units : KM-S

03:52 <discord-> s​cimas. — Output type : GEOMETRIC cartesian states

03:52 <discord-> s​cimas. — Output format : 2 (position and velocity)

03:52 <discord-> s​cimas. — Reference frame : ICRF

03:52 <discord-> s​cimas. — ```

03:53 <discord-> s​cimas. — Something more at the end

03:53 <discord-> s​cimas. — ```

03:53 <discord-> s​cimas. — JDTDB Julian Day Number, Barycentric Dynamical Time

03:53 <discord-> s​cimas. — X X-component of position vector (km)

03:53 <discord-> s​cimas. — Y Y-component of position vector (km)

03:54 <discord-> s​cimas. — Z Z-component of position vector (km)

03:54 <discord-> s​cimas. — VX X-component of velocity vector (km/sec)

03:54 <discord-> s​cimas. — VY Y-component of velocity vector (km/sec)

03:54 <discord-> s​cimas. — VZ Z-component of velocity vector (km/sec)

03:54 <discord-> s​cimas. —

03:54 <discord-> s​cimas. — Geometric states/elements have no aberrations applied.

03:54 <discord-> s​cimas. — ```

03:54 <discord-> e​gg. — looks good, can you give me the line that say `... = A.D. 2015...`?

03:54 <discord-> e​gg. — (in the `$$SOE`/`$$EOE` block)

03:55 <discord-> s​cimas. — Sure

03:55 <discord-> s​cimas. — `2457023.500000000, A.D. 2015-Jan-01 00:00:00.0000, -5.577789251791949E+08, 5.171664042434509E+08, 2.352602613558632E+08, -2.213512403148272E+01, -1.292096929870666E+01, -5.793415914624179E+00,`

03:55 <discord-> e​gg. — OK all good

03:57 <discord-> s​cimas. — Feel free to pin that link if people often ask for something like that.

04:01 <discord-> e​gg. — [link for an initial state file for 2020-01-01T00:00:00.000864 removed, it was probably a bad idea anyway and the 864 μs offset is just disturbing] (not sure why Horizons didn’t want to give me a point at JD2458849.5…) (edited)

04:04 <discord-> e​gg. — You should probably post those on the forum too, I think there are plenty of people who are not particularly interested in starting in the fifties

04:05 <discord-> e​gg. — (especially in the Principia userbase, if you are desperately trying to get into orbit Principia doesn’t change much)

04:40 <discord-> K​erbinator. — Reachstar to you : Thanks!

04:40 <discord-> K​erbinator. — (From QQ chat :3)

16:49 <discord-> e​gg. — > 坎巴拉东方计划

16:49 <discord-> e​gg. — > 拒绝让你加群

16:49 <discord-> e​gg. — @Kerbinator hmm...

18:13 <_whitenotifier-9244> [Principia] Tutul- opened issue #2788: [Question] Recommanded tool to simulate n-body to test modified system - https://git.io/Jkug8

21:55 <discord-> Z​eusbeer. — Has Reach entered the chat?

21:57 <_whitenotifier-9244> [Principia] pleroy commented on issue #2788: [Question] Recommanded tool to simulate n-body to test modified system - https://git.io/Jku77

21:57 <_whitenotifier-9244> [Principia] pleroy labeled issue #2788: [Question] Recommanded tool to simulate n-body to test modified system - https://git.io/Jkug8