I'm trying to figure out the time periods in which 2 planets (2nd and 3rd in their system) are within a particular distance X from each other (say, for example, when they are 90 million kilometers or less away from each other).
I imagine there is no one or two-click way to do this, so what I've tried doing is use the Travel Calculator between the 2 planets, plugging in date after date, and jotting down the distance that pops up each time, to figure out when these planets get that close to each other, then drift apart again. (Basically, I want to figure out what the cycle for this event is).
Does this sound like it would work? I tried it a bit yesterday and I got a bit confused. Sometimes the planets at date A look far closer to each other in the orbit view than at date B, yet when I use the Travel Calculator, the distances between them are practically the same for each case. (The third planets' orbits is very eccentric, so it, so to speak, crosses the other's orbit at 2 points.)
Any suggestions or comments would be appreciated.