Earth is the birthplace of human civilization. Humans in various societies across the Milky Way trace their origins back to Earth. It holds symbolic importance to the members of the New Earth Hegemony, also known as the Earth Cult, who undertook the massive project of moving the planet from its previously known location in the Sol system to one in the center of the Milky Way.
If you're reading this, you're most likely already there.
- Earth on Wikipedia