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I once made an ion craft in a sandbox game and spun it out to Duna but it was able to do it in a single burn. When I watch videos on youtube I often see people doing multiple burns at periapsis to take advantage of the oberth effect, which I get. What I don't know though is how do you calculate what burn you need to do the transfers? Obviously you can't set up a single node ( or maybe you do ) for a single burn and surely after say 5 burns the planet your orbiting will be a day or 6 ahead in it's orbit so how do you know if you're still on target? The only video I've seen that even briefly covered how to do it was one of Matt Lowne's but it was very brief, I didn't quite get it the first time around and now I can't find which video it was. Can someone explain it to me or direct me to a guide on the subject?