Sunset. Evening/night time begins.
When the sun sets over the horizon, we say that the day is coming to a close or that night is falling.
We say that it sets.
risen or set
Possibly you might say good morning.
horizon
you could say the horizon is a rizen' (as in the horizon is becoming higher)
Horizont
The land or ocean features would vary depending upon where you are, but one could safely say it rises over the eastern horizon.
Depletion is when something goes down. For example: Let's say you had many people and a large amount of food. Over time that food will start to deplete (go down), until there is nothing left.
its ορίζοντας (horizontas)
the sun rose
Buddy Holly