Possibly you might say good morning.
We say that it sets.
risen or set
The sun comes over the horizon, and we then have 'day' as opposed to night.
Good Night
Every beam brings a dream, dear, of you.
The sun sets over the horizon.
Sunset. Evening/night time begins.
The sun rises in the east.
I call it sunrise
The sun rose gently over the eastern horizon.
The horizon is the furthest point the eye can see. The sun rises over the horizon because as the earth turns, the sun gradually comes in to view as the side of the earth we're on turns towards it. The sun isn't really rising - we're simply moving. It's like if you slowly turn to look at something, it doesn't magically appear in front of you, it comes in to sight, and as you turn it comes more and more into your vision.
Just over the horizon.