Answer:
I pass before the sun, but make no shadow.
Being able to interpret the letters on this screen proves that you have this quality.
Up on high I wave away but not a word can I say.
This only turns over once you have travelled very far. What is it?
A seed am I, three letters make my name. Take away two and I still sound the same.
Break me and I am better immediately set and harder to be broken again.