Multiple realities(covers information from several alternate timelines)
Eminiar was a star in the Alpha Quadrant. (Star Trek VI: The Undiscovered Country, production art) This star, the primary of the Eminiar system, was located within the NGC 321 star cluster.(TOS: "A Taste of Armageddon")
The location of Eminiar in the Milky Way Galaxy was depicted on a Federation star chart in 2293. (Star Trek VI: The Undiscovered Country, production art)
In 2367, the star appeared on a chart in Captain Benjamin Maxwell's ready room on the USS Phoenix. (TNG: "The Wounded" display graphic)
In an alternate 2366, Eminiar was marked on a tactical situation monitor showing the fleet deployments in the Federation-Klingon War. (TNG: "Yesterday's Enterprise" display graphic)
The location of Eminiar on "The Explored Galaxy" star chart
The location of Eminiar on a tactical situation monitor
On the tactical situation monitor, the location of Eminiar was displayed twice. In "The Explored Galaxy" star chart, Eminiar was located between the Tholian Assembly and Romulus. Both were identified in DS9: "Call to Arms" as being located in the Alpha Quadrant. This chart, first seen chronologically in Star Trek VI: The Undiscovered Country, was also seen in several Star Trek: The Next Generation and Star Trek: Deep Space Nine episodes set in the 24th century, from the year 2364 to 2370. These were TNG: "Conspiracy", "The Measure Of A Man", "The Emissary", "The Mind's Eye", "The Game", and DS9: "In the Hands of the Prophets", "Cardassians".