I also wondered why we call them sunsets, when the sun is clearly not the one who is setting.
put yourself in the sun's shoes. the sun can't set of it's own accord. the sun doesn't realise it's making those pinks, purples and oranges on the horizon. the sun doesn't know what a horizon is.
we human beings create all of this.
the human mind makes the horizon and then it makes the sun set on it. those pinks, purples and oranges are forged inside your eyes.
next time you see a sunset, tell yourself: 'it is me who is setting the sun. the sun is setting and I am the one who is doing it.'