Crepuscula was an inhabited planetary system in the Beta Quadrant. The Crepusculan homeworld was located in this system.
Stellar cartography[]
In 2259, Crepuscula's position was seen on a stellar cartography chart seen on the USS Enterprise's ready room viewscreen. The location's symbol had a blue color, indicating that it was affiliated with the Federation. (SNW: "A Quality of Mercy")
In 2324, the location of this system was labeled in a chart used during a Section 31 Alpha Team briefing. (Star Trek: Section 31)
In the 33rd century, Admiral Michael Burnham remarked that she thought Captain Leto would be "halfway to Crepuscula by now" when he arrived on Sanctuary Four to take the Admiral back to Starfleet Headquarters. (DIS: "Life, Itself")