Re: Tenkan - advanced
I like that comment, Mark. Very cool and large scale! Linguistically tenkan has the meaning of change so it wouldn't normally be used for a recurring natural phenomenon (because the earth rotates on its axis without producing change). But you can say tenkanki 転換期 for the earth. Ki here means chance - it's the same kanji as go in ichigo ichie 一期一会 (which I used just yesterday in my aikiblog - the chance encounter which will never be repeated). So it can mean an irregular global phenomenon like the volcano eruptions in Iceland or the oil spill in the Gulf.
Keeping with the large scale theme maybe instead of using the tenkan to blend with the direction of the attack we can think about using the tenkan to blend with the direction of the universe... Now we really are in "Tenkan - advanced" territory!