Dolphin

Earth, located in Sector 001 in the Alpha Quadrant, is the capital planet of the United Federation of Planets. Starfleet Headquarters, Starfleet Academy, and the Office of the President of the United Federation of Planets are located there. In orbit of Earth is Earth Spacedock, a major hub for ships in the Alpha Quadrant. The dominant sentient and sapient life-forms on Earth are Humans, although the Voth and Dolphins also come from Earth. Seeing as it is the planet we live on, I think it makes the perfect starting point for the Location of the Day.

Spacedock (Earth)Memory Alpha

Alpha QuadrantMemory Alpha

Sector 001Memory Alpha

Starfleet HeadquartersMemory Alpha

Starfleet AcademyMemory Alpha

VothMemory Alpha

DolphinMemory Alpha

HumanMemory Alpha

United Federation of PlanetsMemory Alpha

EarthMemory Alpha