I think there IS a reason.
You don't go DIRECTLY to your destination in space, but where it WILL be when you get there.
So, in Apollo, they didn't aim for the moon, but rather where it would be in 3 1/2 days.
Or am I in error here?

__________________
I calculated the odds of this succeeding versus the odds I was doing something incredibly stupid...and I went ahead anyway. - Crow T. Robot

Godspeed, John Glenn. - Scott Carpenter

And these atomic bombs that science burst upon the world that night were strange even to the men that used them.
- H.G Wells, The World Set Free

To the conspiracy crowd, radiation is a big Boogey Man that inspires terror and death in all who encounter it. - JayUtah