Yeah, when I was working with smaller stuff to test it, I could see the values in the object viewer moving around - so I was using that for tweaking.
Then I moved onto the moon itself, and it just stopped working altogether - no value movements, but the objects were moving about.
I’ve re-wrote my own stuff anyway using a couple of functions. This gets the rotation rate:
And then this bit of mess sets it:
And I’ve now got a smooth transition where the moon rotates around the night sky based on the time interval that’s input. I’m going to add a bit of rotational variety to it so its not just a vertical rotation, and I need to find a way to keep the moon rotated vertically upward so it doesn’t flip at 90 degrees from 0,0,0.