Nice work, Keermalec!<br /><br />I would just emphasize something you've pointed out several times: most of these numbers are based on circular planetary orbits, and in reality the numbers shift quite a bit. <br /><br />It gets very tricky to figure out the timing in the real solar system because that nifty equation using degrees movement per day no longer works. What my software does is move forward in time to find the planets in about the right phase angle position, and then recalculates the planetary radius at the actual dates, then the phase angle is found anew and it searches forward in time again to find the more correct launch date. It continues this iteration until the planetary radius error is less than the SOI distance.<br /><br />Anyway, to all, FWIW, I'm keeping an eye on this thread and all of Keermalec's work, and if the numbers look iffy to me, I speak up. I think I've found just one quibble on this entire thread. I'll have to look again to find it.<br /><br />The point of this post is that Keermalec's numbers look accurate to me, but it is important to realize that the true eccentric orbit of Mars changes things quite a bit.<br /><br />Oh I remember the quibble now: the lower-energy trips to Mars run in a cycle of about 11-1/2 years IIRC. A number of 20 years was stated, implying a 40 year cycle, and that for sure is not correct. This cycle is tricky to define, BTW.<br /><br />We've just past the lowest dV opportunities in 2005 and 2007, and they will be low again in ~2016-2018. <div class="Discussion_UserSignature"> </div>