Question

I live in a town-home and my room overlooks the Rocky Mountains. As you might have guessed, the sunset from my room is phenomenal.I can see the sun going down into the mountains as I write this and I am noticing something very peculiar. It's not setting where it usually does. About 10-15 degrees towards the North-West (if I set west as where it usually sets). Has the earth tilted a bit around its axis? Or is this one of the things that happens with living in a Geoid-shaped Earth?

Any astrologers/astrophysicists out there? (or someone with a different title who is supposed to know this?)