hii just wanted to say that i think ur orbits implementation is super cool and elegant. i've been doing the digitized version you saw from twitter (using vassal) and its about halfway done at the moment. it has motion and ships/missile implemented but other convenience functions and econ stuff isnt set up yet. i have it up on github if you want to check it out https://github.com/kerbo2/CampaignForTheSolarSystem.