Question

Is sun a common noun?

Is sun a common noun if yes how.

Answer 1

Yes, but there are exceptions;

Explanation:

When nouns such as "earth", "sun", "moon", "Mars", and et cetera are used in an astronomical context they are capitalized, but otherwise they are common nouns.

Example for when they wouldn't be capitalized;

"The moon is so beautiful here on earth tonight."

Example for when they would be capitalized;

"The Sun, Earth, and Moon all belong to the Milky Way,"