Multiple realities(covers information from several alternate timelines)
Murasaki 312, or the Murasaki Quasar, was a quasar-like electromagnetic phenomenon.
Murasaki 312 was three days away from Makus III at warp speed 1. (TOS: "The Galileo Seven")
In 2367, the location of Mursasaki 312 was labeled on a tactical situation monitor in Captain Benjamin Maxwell's ready room on the USS Phoenix. (TNG: "The Wounded", okudagram)
In 2368, the location of Murasaki 312 was labeled on a tachyon detection grid on one of the viewscreens of the USS Enterprise-D bridge. (TNG: "Redemption II", okudagram remastered)
In 2366, in an alternate timeline, during the Federation-Klingon War, the location of Murasaki 312 was labeled on a tactical situation monitor in the ready room aboard the Enterprise-D. (TNG: "Yesterday's Enterprise", okudagram)
In 2267, this quasar ionized an entire sector, including four star systems. This quasar, and others like it, generated what was known as the Murasaki Effect.
Sensor readings from the Enterprise attempted to describe Murasaki 312:
Captain James T. Kirk of the USS Enterprise was under standing orders to investigate formations similar to Murasaki 312, consequently delaying the Enterprise from a medical supply mission to Makus III, and sending the shuttlecraft Galileo to survey the formation. (TOS: "The Galileo Seven")
In 2367, around stardate 44390,1, the USS Enterprise-D conducted a long-range sensor scan of the Murasaki Quasar. (TNG: "Data's Day")
The location of Murasaki 312 on a tactical situation monitor
The Murasaki Effect (2267)