The 40 Eridani A Starfleet Construction Yards were 24th century Federation shipyards located in the Vulcan system in Sector 001.
The Miranda-class starship USS Brattain was built by Yoyodyne Division at these yards on stardate 22519.5. (TNG: "Night Terrors")
The Nebula-class starship USS Phoenix was built by Yoyodyne Division at these yards on stardate 40250.5. (TNG: "The Wounded")
The Nebula-class starship USS Prometheus was built by Yoyodyne Division at these yards. (DS9: "Second Sight")
After the Attack on Mars in 2385, Admiral Jean-Luc Picard proposed to Starfleet that mothballed ships from Eridani A and Beta Antares be used to maintain the evacuation of Romulans from the Romulan supernova, albeit at a severely reduced level. The proposal was rejected. (PIC: "The End is the Beginning")