Question

What Article Should we use on Sun is it "the sun" or *a sun*​

Answer 1

Answer: The sun

Explanation: "The" article is always used on celestial bodies for example: the earth, the moon etc.

Answer 2

Answer:

The Sun

Explanation:

The sun is a celestial body, it would not make sense to call it "A Sun". Also, "A" is usually used when there's a specific type of thing you're talking about, there is only one type of Sun.