Readme contains wrong info

[PiloniA]

I am not sure if this is the right place for that issue:

In the Readme under Concepts-PlottingFrame (https://github.com/mockingbirdnest/Principia/wiki/Concepts#plotting-frame) in the 3rd paragraph it is stated:

"In addition, both the Sun and Earth rotate around you (or rather, the Moon) once every month."

This is not true. When you are standing on the moon, the earth seems to be on a fixed point (with a bit of wobble). This is why we on earth always see the same side of the moon. As a result also the graphic is wrong.

[pleroy]

Wow, this has been around since 2016 and nobody noticed (or: nobody commented), egg on my face. Thanks for reporting.

I need to think a bit, because the goal of this document is to explain reference frames to beginners, so it needs to be simple enough. I'm concerned that the actual motion of the Earth seen from the Moon (a relatively small loop, due to nutation and to ellipticity) is going to be rather more difficult to explain and understand.

[PiloniA]

You are welcome! 😊 As Software Tester I always find many Bugs and Typos others didn’t 😉

Maybe, instead of the moon, you can use an artificial satellite as “observer”, which is on a high earth orbit, oriented to a distant star? Might be too complicated for beginners though… I am sure, you will find something appropriate!

By the way, you did an amazing work with this mod. I just now reinstalled KSP with RO / RP-1 and Principia to distract me from the current KSP2 situation

Best regards Alexander

Von: Pascal Leroy @.> Gesendet: Donnerstag, 9. Mai 2024 13:15 An: mockingbirdnest/Principia @.> Cc: PiloniA @.>; Author @.> Betreff: Re: [mockingbirdnest/Principia] Readme contains wrong info (Issue #3998)

Wow, this has been around since 2016 and nobody noticed (or: nobody commented), egg on my face. Thanks for reporting.

I need to think a bit, because the goal of this document is to explain reference frames to beginners, so it needs to be simple enough. I'm concerned that the actual motion of the Earth seen from the Moon (a relatively small loop, due to nutation and to ellipticity) is going to be rather more difficult to explain and understand.

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