Starbase 9

Starbase 9 was a Federation starbase constructed in the 22nd century, and was located near Sector 001.

In 2267, the USS Enterprise was enroute to Starbase 9, when they encountered a black star and were flung back in time to the 20th century. (TOS episode: "Tomorrow is Yesterday").

Later that year, the Enterprise was headed for shore leave at the starbase when Lieutenant Commander Montgomery Scott celebrated his birthday. (TNG novelization: Relics).