On 17 Feb 2006 13:29:33 -0800, in a place far, far away, "Will McLean"
made the phosphor on my monitor glow in such a
way as to indicate that:

D'oh!. I meant to say 180 degrees in half a lunar month, or 360 a
month. Or any multiple of that, since I don't require a constant angle
with respect to to the system. I want to arrange the precession so that
every time the lauch window opens to a particular lunar orbit, the moon
is in the plane of the parking orbit.

That makes more sense. But I'm not aware of any way to get a lunar
(and I assume that you want it to be a lunar polar) orbit to do that,
absent continuous thrusting (you could do it with an ion drive, or
perhaps a sail). Of course, if you are aligning it with a bimonthly
launch window, 180 actually would work--it would just be a matter of
entering from above versus entering from below.

Anyway, what's wrong with L1, other than the performance hit (a
penalty I think well worth paying)?


Performance hit, the travel time,

Only an extra day or so, I believe. What's the big deal?

and L1 is no longer an option with the current plan.

Ah, but other people can make better plans.