Circumstance is a UEG colony world in the Epsilon Eridani System, along with Tribute, Beta Gabriel, and Reach. Circumstance was apparently famous for its universities and courts of justice. It is unknown if it was glassed by the Covenant or still held by the UNSC. Kurt-051 was born here in Mira in 2511, eventually growing up in Kuiper, before being abducted by ONI.
- In the Halo: Reach live-action short Spaceport, Circumstance is a destination listed at the Manassas Spaceport.