Earth (also Sol III or Terra) was the inhabited third planet of the Sol system. Earth was the homeworld of the Humans and the Voth, among others, and was the capital planet of the United Federation of Planets.
In 2150, with the last nation-states joining, the planet was unified under the United Earth government. It was a founding member of the Coalition of Planets in 2155, and of the United Federation of Planets in 2161. The President's office, the Federation Council, as well as Starfleet Headquarters and the main branch of Starfleet Academy were located on Earth. During the Dominion War, Earth's strategic importance was on par with worlds like Andor, Berengeria VII, and Vulcan.