Answer:
What gets broken without being held?
What can be measured but has no length, width or height?
It comes only before, it comes only after. Rises only in darkness, but rises only in light. It is always the same, but is yet always different.
I have one eye, See near and far, I hold the moments you treasure, And the things that make you weep.
If you are unsure how to use one then just ask a flight attendant.
How do you know if a sniper likes you?