Great question Peter. :-) I dun'no. I have been trying to figure that out myself. I do know the moon is amazing tonight casting its net far and wide. I have a new friend visiting me on the porch . . . a cat. We have been getting to know each other over the past few weeks. It arrives at the steps to the Porch usually around 4AM when I sit on the front Porch.
At first it would walk by and I would say hello. Later it stopped looking up the steps. Tonight it walked up the steps and sat beneath the chair across from the one I sit in. It stayed a short visit and then walked away.
Exciting . . . I wonder if it will respond if I give it a name. :-)