If you are referring to Pablo Neruda's "Tonight I can Write", then the poem describes kisses under the A. endless sky. This is what he says:
"Through nights like this one I held her in my arms.
<span>I kissed her again and again under the endless sky."</span>
Answer:
The word, "the" is an article.
Explanation:
The words, "the", "and", & "a" are called articles.
Hope this helped! :)