But if it is a question, why the correct variant isn't "Do you see the star in the South?"
In English, especially spoken, it's OK to ask a question in this manner, accompanied by a rising intonation of speech. For example, "You see that person over there?"
It would, but it's colloquial without the auxiliary verb 'do' ("Do you see ... ?").
It models the prompt. Requiring "Do you see..." Would match a prompt that starts: "Ты видишь..."
"Do you see a star at the South?" Почему неприемлем неопределенный артикль?
How obligatory the article before South? Do you see.. wasn't accepted?!!! Blunder!
Северная звезда фактически выровнена с земной осью, поэтому она всегда находится в небе.
You do not have to correct my english preposition.you have to check if i understand the russian