.he stretched out his arms toward the dark water in a curious way, and, far as I was from him, I could have sworn he was trembling. Involuntarily I glanced seaward — and distinguished nothing except a single green light, minute and far away, that might have been the end of a dock. When I looked once more for Gatsby he had vanished, and I was alone again in the unquiet darkness.
Answer:
They tell what each section is mostly about
Explanation:
For example if you were writing a paragraph about how your dog looks you're header might be something like "About My Dog" or something to that effect. Sorry I'm not very good at explanation but I hope this helped you. :)
It was written in England some time between the 8th and the early 11th century.