Thanks, Budd. I'll wait for Dan to clarify. In the Chinese MA paradigm I'm familiar with, sinking (or yin) energy, heaviness, is associated with earth, and rising (or yang) energy, lightness, is associated with heaven; cf. in-yo in Japanese. Dan is welcome to use the terms as he sees fit; I just wanted his clarification as to how he intended to use them.
I don't intend to speak for Dan, but I can speak on this based on my training with him. In our training, we look at all up energy coming from the ground (earth) and all down energy coming from gravity, which could be viewed as coming down form heaven.
I guess it all depends on how you look at the energy - do you look at the direction it is going or the direction where it is coming from - both are correct depending on your perspective