Answer:
Cold head and feet; round as a ball; always turning around myself.
I am between earth and heaven. What am I?
I am the best thing that can happen after a stick hits a ball.
Curtail me thrice I am a youth; behead me once a snake; complete I'm often used in truth when certain steps you'd take.
I run around the city but I never move.
It's what light turns into in the night