Answer:
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
In we go, out we go. All around and in a row. Always, always steady flow. When we'll stop, you'll never known. In we go, out we go.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?
I'm tall in the morning and short in the noon. I disappear at night but I will be back soon.
What covers its face with its hands, speaks no language, yet most known what it's saying?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?