Answer:
What can be measured but not seen?
Pregnant every time you see her, yet she never will give birth.
It regulates our daily movements, but it feels no interest in our lives. It directs us when to come and go, but does not care if we pay attention. What is it?
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
Long and slinky like a trout, never sings till it's guts come out.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.