Is "The sun will rise in the east" correct?

Why

Daksh's logic makes sense on the surface — the sun really will rise tomorrow and every day after, so pointing to the future doesn't seem wrong. English reserves the simple present tense for a special job, though: stating facts, general truths, and things that are always true, not just things happening right now. "The sun rises in the east" isn't describing one single sunrise happening at this moment — it's stating a permanent fact about how the world works, and permanent facts use simple present, even though they obviously extend into the future too. "Will" is saved for something expected to happen at a specific future point that isn't already an established, ongoing truth — like "It will rain tomorrow", a specific prediction, not a standing fact. Test: compare "Water boils at 100 degrees" with "Water will boil at 100 degrees" — the first sounds like a textbook fact, the second sounds like it's describing one specific future pot of water. His teacher is right: general truths and facts use the simple present tense, not the future tense, even though they hold true going forward.