Otherwise if I am trying to do the above I do a test launch, see how close I am, the relaunch, adjusting. I've never been able to time launches very well so that's how I tend to go about it. I know you are trying to achieve something very specific, and I can't answer that better than has already been answered, but an alternative is obviously to get into LKO say 80km, then Hohmann transfer up to target 100km using maneuver nodes. How do I calculate how far away my target should be at the time I start up the engines on the runway so that I intercept it as close as possible? As I said, target orbit is 100x100km, and my SSTO reaches it's apoapsis in 16 minutes from the moment it starts rolling on the runway. But it will take my ages to determine the correct separation by trial and error. Once it goes down to a certain number, I launch. I'm using simple target distance between my SSTO and target. The question now is - how do I correctly time the launch so that at the time of circularization burn, I'm as close to the target as possible (preferably under 5km). My SSTO takes around 16min to reach apoapsis where it can perform circularization burn. I want to use it for transportation of crew and stuff to the KSS (Kerbin Space Station) I've built before. I have build my first SSTO (level 6, with no upgrades to hangar), that is capable to reach 100x100km orbit with around 120m/s dV to spare (not including deorbiting burn). I'm sure this has been discussed before, but I really couldn't find any definitive answers to the issue except for "guess until it works".
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