|Centuries:||23rd Century||24th Century||25th Century|
- 10: The Federation announces that the Hobus star has been stabilized by Doctor Tolian Soran, twenty-seven years before the massive supernova that would have destroyed the core of the former Rihannsu Star Empire.
- 3: Ambassador Spock retires from the diplomatic corps and settles on ch'Rihan. His doppleganger from this universe, Admiral Spock, announces his retirement from Starfleet and takes his counter-part's place in the diplomatic service.
- 19: Pahkwal joins the United Federation of Planets.
- 22: The Federation establishes a colony on Minos Korva.
- 25: Samnar joins the United Federation of Planets.