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--> Reply to "s​ic​he​lg​ai​ta​: The reference_angle is the position of the prime meridian at the reference_instant, w..."
<queqiao--> <b​al​li​st​ic​fo​x> Just to double check my reasoning here, this is a 16384 pixel wide map The map is from [0,16384] pi... https://paste.gg/p/anonymous/05f80a006e3b41bda572a67f520d2037
<queqiao--> <s​ic​he​lg​ai​ta​> The reference_angle is the position of the prime meridian at the reference_instant, which in Princip... https://paste.gg/p/anonymous/fe18c46eddff4ae9a1f5746c83f53777
<queqiao--> <b​al​li​st​ic​fo​x> I assume something similar needs to be done to place Claudia at 146E (same link as before, DWNVGRS_2... https://paste.gg/p/anonymous/1b04037b6cd6407da338011cd10c40ee
<queqiao--> <b​al​li​st​ic​fo​x> Looks close enough, assuming your logic with Kait being at 170.309 is correct or that I'm misunderstanding what you mean by longitude 170.309° at J2000 (specifically on why the epoch is important here as it's fixed) https://media.discordapp.net/attachments/480397772248580098/1419540205219741696/image.png?ex=68d22156&is=68d0cfd6&hm=030aa80c8a772673b76855f3dd959e935e4b5f4c9c68ae53ad7fc8b86a40f5f3&
<queqiao--> <e​gg​> You are probably misunderstanding. This is celestial longitude. See Figure 2 of https://aa.usno.navy.mil/downloads/reports/Archinaletal2011a.pdf, the reference angle is the value of W at the epoch.
<queqiao--> Reply to "b​al​li​st​ic​fo​x: Just to double check my reasoning here, this is a 16384 pixel wide map The map is from [..."
<queqiao--> <e​gg​> This is probably nonsense, since that 170.309 is a celestial longitude. Kait crater needs to be where 0 longitude goes; if I recall correctly that is not the middle of the image but a quarter of the way through.
<queqiao--> <e​gg​> But anyway, if you want to check that what you are doing is correct, the only reliable way to do that is to apply the same procedure to Earth and see if it ends up oriented as it should.
<queqiao--> <b​al​li​st​ic​fo​x> Just to double check my reasoning here, this is a 16384 pixel wide map The map is from [0,16384] pi... https://paste.gg/p/anonymous/97958ad735704722b28b99343f64b6b0
<queqiao--> <e​gg​> I had done some analysis for the Pluto texture in RSS nine years ago: https://github.com/KSP-RO/RealSolarSystem/issues/91 (I think these are still incorrectly oriented).
<queqiao--> Reply to "e​gg​: This is probably nonsense, since that 170.309 is a celestial longitude. Kait crater needs..."
<queqiao--> <b​al​li​st​ic​fo​x> I figured so, I was almost hoping it wasn’t that since there’s not really a good way to check itAlso to clarify what’s in that GitHub issue, textures loaded into KSP need rotated 180 degrees (horizontal + vertical flip), then translated -1/4th the width of the texture (90 degrees)this was a test grid I used last night to double check myself after a conversation with Charon_S
<queqiao--> <b​al​li​st​ic​fo​x> Perhaps I could first verify the orientation of the celestial sphere skybox and then use known stars to figure out my celestial longitude and latitude at the J2000 at (0N,0E) on Ceres
<queqiao--> <e​gg​> > textures loaded into KSP need rotated 180 degrees (horizontal + vertical flip), then translated -1/4th the width of the texture (90 degrees), assuming your base map is [-180,180] and positiveEast
<queqiao--> <e​gg​> Yeah that seems consistent with my findings there.
paculino_ is now known as paculino
<_whitenotifier-7147> [Principia] pleroy opened pull request #4312: Document the effect of the various optimization in accurate table generation - https://github.com/mockingbirdnest/Principia/pull/4312
<_whitenotifier-7147> [Principia] pleroy closed pull request #4312: Document the effect of the various optimization in accurate table generation - https://github.com/mockingbirdnest/Principia/pull/4312
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