The Antemeridian sector existed within the Outer Rim Territories, bordering the Meridian sector. Antemeridias served as the sector's capital planet.
While the Imperial regime held sway, Moff Getelles oversaw the sector's administration. Following the Battle of Endor, the Antemeridian sector achieved independence under Moff Getelles' governance. Nevertheless, Getelles remained a loyal ally of the Empire, eventually aligning with Pellaeon's Imperial Remnant.
In 13 ABY, Getelles attempted to seize control of the neighboring Meridian sector, but the New Republic thwarted his efforts before Admiral Pellaeon could offer assistance. The sector then transitioned to New Republic governance until the Yuuzhan Vong War brought about an invasion.
Following the conclusion of the Second Galactic Civil War, the sector reverted to Imperial control, with Moff Getelles, by then a supporter of Jagged Fel, resuming his role as governor.