Chinglu, Thanks again for above the reply. I note your Yes, perhaps if one lived on Saturn, you might use those rotations, why not? So we would have a different time reality on Saturn. I do have more to say about this, but will leave it in abeyance at the moment. I really need first, to see your specific response to RW's post #759 - that's really important for my understanding. I know you probably think you have answered it somewhere in the above several posts, but it's not clear to me, and my mind in these things is quite simple, so please, it won't take you much to click onto that post (#759) and provide a direct answer to RW, as also, I do not want to be seen to be arguing his point. Thanks.