Emily Dickinson's writing style is most certainly unique. She used extensive dashes, dots, and unconventional capitalization, in addition to vivid imagery and idiosyncratic vocabulary. Instead of using pentameter, she was more inclined to use trimester, tetrameter, and even dimeter at times.
But it appears to rise and set because of the Earth's rotation on its axis. It makes one complete turn every 24 hours. It turns toward the east. As the Earth rotates toward the east, it looks like the sun is moving west.