Trekipedia

Starbase 9

Primarily a resupply post^[3] near Pyris VII,^[2] Starbase 9, commanded in the 2260s by Commodore Lee Block,^[3] hosted a larger-than-usual science complement, which studied incoming transmissions from unmanned monitoring stations left behind by Starfleet explorers. When something strange happened in deep space, the officers of Starbase 9 were usually among the first to hear about it.^[3] In 2266, the U.S.S. Enterprise NCC-1701 was en route to Starbase 9 for resupply when a near-collision with an uncharted black star propelled the ship back in time.^[1] Several months later, it was the closest base when the Enterprise visited Pyris VII.^[2]