(covers information from several alternate timelines)
In 2364, the location of Procyon was labeled in a star chart of a stellar neighborhood with Sol at the center. This chart was stored in the USS Enterprise-D library computer. Later that year, the chart was scanned by Outpost 63. (TNG: "The Naked Now", production art; TNG: "The Last Outpost")
Background information Edit
The star chart naming the stars within twenty light years of Sol was drawn by Rick Sternbach for the Star Trek Spaceflight Chronology (p. 77) in the late 1970s. This chart showed Earth commercial and exploration routes after the use of warp drive began. There were no commercial or exploration routes to this system.
According to the Star Trek: Star Charts (pp. 19 & 36) and the Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the two stars of the Procyon (Andoria, Alpha Canis Majoris) star system were a F-class star and an A-class star. An inhabited moon, Andoria (the Andorian homeworld), was located in this system. In the 22nd century, the system was a stop on the Earth trade routes. The system was located in Sector 006 (Andorian Sector) in the Beta Quadrant.