Some general-purpose math for working out transfer windows: Let's say you're at planet 1 (Jool, in your case), transferring to planet 2 (Sarnus). Assuming that both planets are in circular orbits: Let's define some terms: t1 = the orbital period (length of year) for planet 1 t2 = same deal for planet 2 th = Hohmann transfer time (i.e. half of an ellipse) Assuming that you know t1 and t2, you can calculate th as follows: th = ((t1^(2/3) + t2^(2/3)) ^ 1.5) / sqrt(32) "take t1 raised to the 2/3 p
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