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Kerbal Scenarios & Missions using the n-body gravitation & angular momentum mod "Principia" NOTE 2022 January: With TeacherGaming closing its doors, the login based KerbalEDU 1.4.5 & 1.3.1 are no longer available. Private Division has released, to current holders of KerbalEDU, the old installer based KerbalEDU 1.2.2. For anyone desiring to use Principia in an EDU setting, I recommend using the most recent KSP (currently 1.12.3) as both Principia & KSP have progress tremendously since 1.2.2 and also since the Principia developers only support the current release of Principia. That said, if you really want to tinker with Principia without support in KerbalEDU 1.2.2 then Principia Cramer and its specific install dependencies (also study the Principia install instructions) was the last version to support KSP 1.2.2. The KSP save files I provided below will not work in 1.2.2 as they are for later versions of KSP. To start, I instead suggest tinkering with the ship in the KSP save posted at: Principia Challenge: Munar Retrograde Rendezvous (1.2.2) [edit 2020 March: expanded this topic to cover EDU related Principia activities rather than just one Mun mission] Table of Contents (= Links to key posts below with details): Principia Mun "Free Return" FlyBy Tips regarding creating scenarios by editing .sfs saves with Principia scimas' RSS Principia "initial state" files for various epochs Principia Challenge: Munar Retrograde Rendezvous (1.2.2)