The 40 Eridani A Starfleet Construction Yards are Federation shipyards located in the 40 Eridani A star system in the 24th century.
The Miranda-class starship Brattain was built by Yoyodyne Division at these yards on stardate 22519.5.
The Nebula-class starship Phoenix was built by Yoyodyne Division at these yards on stardate 40250.5.
(TNG: "Night Terrors"; TNG: "The Wounded").
Background
The existence of these shipyards is not from aired dialogue, but is derived from the text of the starship dedication plaques.