egg changed the topic of #principia to: Logs: https://esper.irclog.whitequark.org/principia | <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…
<queqiao-_> ⟨T​urboEJ20⟩ So hey all, coming from using mechjeb for like the last 6 years for everything....how do i do precise burns in principia. If i have Mechjeb do the burn the bar does not go down. What are we supposed to be doing to be accurate?
<queqiao-_> ⟨P​aculino (ŝi/ri/she/they)⟩ you can manually start and end it and take the spool up time of about one or two seconds into account
<queqiao-_> ⟨P​aculino (ŝi/ri/she/they)⟩ Better Time Warp slow motion helps with precision very well
<queqiao-_> ⟨P​aculino (ŝi/ri/she/they)⟩ And you can always fine tune with rcs later if you are just barely off
<queqiao-_> ⟨S​paceFace545⟩ Mechjeb can execute principia nodes
<queqiao-_> ⟨S​paceFace545⟩ The bar won’t go down because principia overrides the stock node editor
<queqiao-_> ⟨S​paceFace545⟩ Principia runs off a burn time system instead of delta v expenditure
<queqiao-_> ⟨T​urboEJ20⟩ So does MJ still burn for the Dv target or does it just go forever
<queqiao-_> ⟨T​urboEJ20⟩ im just trying to stay launching from Florida and get my first moon impact and stuff, but with single burn engines its proving very difficult. I can do the math and execute it manually which i did on my first fly by. But after that i would rather the computer system made for it execute it for me.
<queqiao-_> ⟨e​gg⟩ There is Principia support in MechJeb (though it doesn’t account for spool-up). If your thing is burning forever, you are misusing MechJeb.
<queqiao-_> ⟨T​urboEJ20⟩ roger, so it should get close and i can just RCS adjust from there
<queqiao-_> ⟨T​urboEJ20⟩ let me be more clear
<queqiao-_> ⟨e​gg⟩ (there should be a button that says « execute Principia manœuvre » or something along those lines)
<queqiao-_> ⟨T​urboEJ20⟩ yea
<queqiao-_> ⟨T​urboEJ20⟩ so once i hit that
<queqiao-_> ⟨T​urboEJ20⟩ even tho the bar does not go down, Mechjeb will still burn for the indicated Dv target correct?
<queqiao-_> ⟨e​gg⟩ MechJeb will ignite when Principia says the ignition should happen, and cut off when it says it should cut off.
<queqiao-_> ⟨e​gg⟩ There is no measuring of the actual Δv going on.
<queqiao-_> ⟨T​urboEJ20⟩ based on time right?
<queqiao-_> ⟨T​urboEJ20⟩ rgr
<queqiao-_> ⟨e​gg⟩ in particular, spool-up time will result in burning under target.
<queqiao-_> ⟨e​gg⟩ any sub-nominal thrust due to :agathorn: will likewise result in burning under target. MechJeb will not care about that, and cut off on time.
<queqiao-_> ⟨T​urboEJ20⟩ gotcha, thanks
<queqiao-_> ⟨F​alcon⟩ Question, how accurate is Principia compared to the software NASA uses for their mission planning, if Egg has been able to compare or see i suppose
<queqiao-_> ⟨Q​uadrupole⟩ 1) The interplanetary trajectories are both *ab initio*, so Principia and NASA's program (e.g., GMAT) should be equally accurate.
<queqiao-_> ⟨Q​uadrupole⟩ 2) Principia has fewer terms in geopotential models (e.g., 30th-order for the moon), whereas GMAT has up to 165th-order. So if you are planning a lunar orbiter that will orbit the moon for ten years, there might be some deviation from reality for Principia.
<queqiao-_> ⟨Q​uadrupole⟩ Of course, the integrator and integration length of Principia and NASA's program could be different, but that depends on how much computational resources you are willing to invest.
_whitelogger has joined #principia
<queqiao-_> ⟨D​0m1nu2⟩ Hey, does anyone also have problem with sunflare after installing latest version of Principia?
_whitelogger has joined #principia
<queqiao-_> ⟨s​ichelgaita⟩ Things that Principia doesn't do that NASA probably cares about:
<queqiao-_> ⟨s​ichelgaita⟩ For celestials: axial precession, general relativity, electrodynamic effects.
<queqiao-_> ⟨s​ichelgaita⟩ For vessels: orbital decay, radiation pressure.
<_whitenotifier> [Principia] pleroy opened pull request #3170: Convert mathematica, physics, astronomy and testing_utilities to DiscreteTraject0ry - https://git.io/JiGoA
<_whitenotifier> [Principia] Pending. Build queued… - 
<_whitenotifier> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/5219/
* UmbralRaptor imagines reaction wheels getting saturated from the YORP effect
<_whitenotifier> [Principia] Failure. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/5219/
<_whitenotifier> [Principia] eggrobin reviewed pull request #3170 commit - https://git.io/JiGPj
<_whitenotifier> [Principia] eggrobin reviewed pull request #3170 commit - https://git.io/JiGXe
<_whitenotifier> [Principia] eggrobin reviewed pull request #3170 commit - https://git.io/JiGXf
<_whitenotifier> [Principia] eggrobin reviewed pull request #3170 commit - https://git.io/JiGXU
<_whitenotifier> [Principia] eggrobin reviewed pull request #3170 commit - https://git.io/JiGXT
<_whitenotifier> [Principia] eggrobin reviewed pull request #3170 commit - https://git.io/JiGXk
<_whitenotifier> [Principia] eggrobin reviewed pull request #3170 commit - https://git.io/JiGXI
egg|laptop|egg_ has joined #principia
<queqiao-_> ⟨e​gg⟩ ЯOРP
egg|laptop|egg_ has quit [Remote host closed the connection]
<queqiao-_> ⟨S​oviet Onion⟩ Cyrillic 😳
<queqiao-_> ⟨S​tonesmile⟩ Typing in Cyrillic is *nothing* for Egg 😆
<queqiao-_> ⟨S​oviet Onion⟩ I do find it interesting that egg always types in the writing system as that of the language the name is in originally
egg|laptop|egg_ has joined #principia
<_whitenotifier> [Principia] pleroy reviewed pull request #3170 commit - https://git.io/JiGMg
<UmbralRaptor> only 2 letters in that acronym are Cyrillic
<queqiao-_> ⟨S​oviet Onion⟩ what can you say UmbralRaptor, egg is very efficient
<_whitenotifier> [Principia] pleroy synchronize pull request #3170: Convert mathematica, physics, astronomy and testing_utilities to DiscreteTraject0ry - https://git.io/JiGoA
<_whitenotifier> [Principia] Pending. Build queued… - 
<_whitenotifier> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/5220/
<queqiao-_> ⟨e​gg⟩ The alternative is transliterations and then you have I︠A︡rkovskīĭ https://www.worldcat.org/identities/lccn-n95003850/
<UmbralRaptor> Now you have two Чебышёв problems
<_whitenotifier> [Principia] eggrobin labeled pull request #3170: Convert mathematica, physics, astronomy and testing_utilities to DiscreteTraject0ry - https://git.io/JiGoA
<_whitenotifier> [Principia] Failure. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/5220/
egg|laptop|egg_ has quit [Remote host closed the connection]
egg|laptop|egg_ has joined #principia
egg|laptop|egg_ has quit [Remote host closed the connection]
<queqiao-_> ⟨Q​uadrupole⟩ Oh yeah. Pre-Soviet Russian othography at its best.
<raptop> ꙮꙮꙮ
<queqiao-_> ⟨Q​uadrupole⟩ By the way I thought axial precession is modeled in Principia. At least there is earth nutation.
<queqiao-_> ⟨e​gg⟩ no there isn’t.
<queqiao-_> ⟨e​gg⟩ the rotation axes of the celestials are bolted to the crystal sphere holding the fixed stars.
<raptop> You drilled threaded holes through the crystal sphere?
<queqiao-_> ⟨e​gg⟩ or perhaps pinned to the vault of heaven which is made of felt
<raptop> Either way, the warranty is probably voided
<queqiao-_> ⟨S​oviet Onion⟩ Google Translate time !
egg|laptop|egg_ has joined #principia
egg|laptop|egg has quit [Ping timeout: 189 seconds]
egg|cell|egg has quit [Read error: Connection reset by peer]
egg|laptop|egg has joined #principia
queqiao- has joined #principia
queqiao-_ has quit [*.net *.split]
mofh has quit [*.net *.split]
mofh has joined #principia
egg|laptop|egg has quit [Remote host closed the connection]
egg|laptop|egg has joined #principia
egg|laptop|egg has quit [Remote host closed the connection]
egg|cell|egg has joined #principia
egg|laptop|egg has joined #principia
<_whitenotifier> [Principia] pleroy closed pull request #3170: Convert mathematica, physics, astronomy and testing_utilities to DiscreteTraject0ry - https://git.io/JiGoA
<_whitenotifier> [Principia] pleroy pushed 8 commits to Ondelette [+0/-0/±62] https://git.io/JiZXr
<_whitenotifier> [Principia] pleroy 9133942 - DiscreteTraject0ry in mathematica.
<_whitenotifier> [Principia] pleroy 8f87728 - DiscreteTraject0ry in physics.
<_whitenotifier> [Principia] pleroy 72e52ca - A few code cleanups.
<_whitenotifier> [Principia] ... and 5 more commits.
<queqiao-> ⟨s​ichelgaita⟩ For the poor souls who don't understand French, here is my translation of the bottom strip:
<queqiao-> ⟨s​ichelgaita⟩ Here is Earth, which, as we know, is a flat disk having Bagdad as its centre.
<queqiao-> ⟨s​ichelgaita⟩ Here is the canopy of heaven, which rotates on itself, and on which the celestials are pinned. The canopy is made of velvet, of course.
<queqiao-> ⟨s​ichelgaita⟩ With an appropriate fuel I have found a way to send the machine to the most distant celestials.
<queqiao-> ⟨s​ichelgaita⟩ For the poor souls who don't understand French, here is my translation of the bottom strip:
<queqiao-> ⟨s​ichelgaita⟩ Here is Earth, which, as we know, is a flat disk having Baghdad as its centre.
<queqiao-> ⟨s​ichelgaita⟩ Here is the canopy of heaven, which rotates on itself, and on which the celestials are pinned. The canopy is made of velvet, of course.
<queqiao-> ⟨s​ichelgaita⟩ With an appropriate fuel I have found a way to send the machine to the most distant celestials. (edited)
<queqiao-> ⟨e​gg⟩ or perhaps pinned to the vault of heaven which is made of velvet (edited)
egg|cell|egg has quit [Remote host closed the connection]
egg|cell|egg has joined #principia
egg|laptop|egg has quit [Remote host closed the connection]
egg|laptop|egg has joined #principia
egg|laptop|egg has quit [Remote host closed the connection]