2265 (Columbia)
- Reference Stardate 2/0700: Armed conflict erupts between the United Federation of Planets and the Klingon Empire. Both sides suffer heavy casualties and begin preparing for full-scale war. Starfleet Intelligence later learns that Klingon Thought Admiral Krador zantai Rrilac has been reassigned to a military governorship on Muldor IV. (FASA 2224)
February
- Reference Stardate 2/0702: The Derf class tender U.S.S. Acropolis responds to a malfunctioning navigational marker buoy. A Klingon warship attacks, crippling the Acropolis, and tows it into Klingon space. Starfleet Intelligence later learns that the Klingons tampered with the buoy, producing the false signal. (FASA 2224)
May
- c.Stardate 1000/Reference Stardate 2/0704 (approx. 13 May): The U.S.S. Enterprise NCC-1701 begins its Five Year Mission under Captain James T. Kirk, following the promotion of Captain Christopher Pike to the position of Fleet Captain over Constitution class starships. (TOS 15; VOY 265; FASA 2001)
- Reference Stardate 2/0705: As a result of the danger posed by the new Klingon base at Mastocal, Federation Starbase 12 is completed and assumes operational status. (FASA 2224)
June
August
- Stardate 1256.9 (approx. 14 August): The Daedalus class Starfleet Corps of Engineers ship U.S.S. Lovell NCC-470 is assigned to provide engineering support to Starbase 47, aka "Vanguard." (SCE #64)
- Stardate 1271.4 (approx. 20 August): Construction of Starbase 47, aka Vanguard, is completed. (VAN #1)
September
- Stardate 1312.4/Reference Stardate 2/0705 (approx. 4 September): After the Enterprise attempts to cross the Galactic Barrier at the edge of the galaxy, crew members Gary Mitchell and Elizabeth Dehner develop "godlike" psychic powers which threaten the safety of the crew. (TOS 01; FASA 2001)
- Stardate 1321.6 (approx. 9 September): (VAN #1)
- Stardate 1329.1 (approx. 10 September): The Enterprise pursues a vessel and rescues its occupants: interstellar con man Harry Mudd, who is arrested on outstanding charges, and three incredibly beautiful women, his cargo. After Kirk diverts to a mining planet to obtain new dilithium crystals for the Enterprise, Mudd negotiates with the three miners there, exchanging the women for his own profit. Finally, Mudd's deception is revealed as the women are, in fact, taking an illegal Venus drug. Kirk obtains the crystals he needs and takes Mudd back into custody. (TOS 03)
November
- Stardate 1512.2 (approx. 15 November): The Enterprise is menaced by a gigantic alien ship whose commander condemns the crew to death. The alien ship appears all-powerful and the alien commander refuses all attempts at negotiation, forcing Kirk to employ an unorthodox strategy to save the ship. (TOS 02)
- Stardate 1528.4 (approx. 21 November): (6 weeks after "Summon the Thunder", date given in "Open Secrets") (VAN #3)
- Stardate 1531.1 (approx. 22 November): The Enterprise visits planet M-113 for a routine medical inspection of the husband-wife archaeological team stationed there, but the crew finds that the wife has been replaced by a deadly, shape-shifting creature. (TOS 05)
- Stardate 1533.6 (23 November): While traveling aboard the Enterprise, a dangerous young man named Charlie Evans terrorizes the crew with his unusual mental powers. (TOS 07)
- Stardate1573.9 (approx. 30 November): (3 weeks after "Reap the Whirlwind") (VAN #4)
December
- 25 December: Captain Kirk meets Dr. Helen Noel at the science lab Christmas party. They dance, and Kirk talks with her about the stars. (TOS 10)
Notes
Captain Kirk's five-year mission was established to have begun in 2265 in the Star Trek: Voyager episode "Q2". The Star Trek] episode "The Menagerie, Part I" further establishes that Spock served under Captain Pike for 11 years, and that it had been 13 years since the events of "The Cage," meaning that Stardate 3012.4 fell in either the end of the second or beginning of the third year of Kirk's command. The episode "Charlie X" further added weight to this, establishing both Stardate 1533.1 and the Earth date of Thanksgiving, which falls on 23 November in 2265. As the stardates ranged from the mid-1000s to the low 3000s in the first season and continued to increase at approximately 1000 per season afterward, it seems logical to conclude that the first season spanned nearly two years, and later seasons one each, with the second season chronicling the 3000s, the third season the 4000s, and the Animated Series the 5000s. If Captain Kirk's command began on or about Stardate 1000, this would put the end of the five year mission on or about Stardate 6000, shortly after the end of the Animated Series. Using these dates as a reference point, the following can be established:
- Stardate 1000 fell on 13 May 2265.
- The range for Stardates each year is from X636 to Y635 (e.g., 1636 to 2635)
- This places "The Menagerie" (Stardate 3012.4) on 18 May 2267, at the beginning of Kirk's second year in command of the Enterprise
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