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Events in bold refer to major incidents or the beginning of significant eras in the timeline.

Pre-Common Era

YEAR	EVENT	REF
~11 billion years ago	Biological life appeared in the Milky Way Galaxy.	Guide
~8 billion years ago	DNA-based life first evident in the Milky Way Galaxy.	Guide
~7.5 billion years ago	A time-traveling culture appears to have colonized on planet 522-IV.	Guide
~4.5 billion years ago	Humanoids first evolve in the Milky Way galaxy.	Guide
~700,000 years ago	The Pnaii is the last FTL culture to have visited and settled (temporarily) the area of space around Earth.	Guide

20th and 21st Centuries

YEAR	EVENT	REF
1992	The Eugenic supermen take over most of South & Southeast Asia.	Guide
1996	Khan Noonian Singh and several of his followers escape Earth, as the Angkor fortress is captured.	Guide
2015	The United Earth Government (UEG) assumes political administration for the majority of the planet.	Guide
2030	Zephram Cochrane is born.	Guide
2032	Ares III, the sixth successful mission to Mars, occurs.	Guide
2035	The AFP-1 prototype is lost in a disaster.	Guide
2036-2039	The first crewed probeships attempt flight out of the Sol system.	Guide
2045	Five spaceframes of the Columbus series are ready for flight.	Guide
2045	(September) UNSS Columbus’ mission delayed to a fueling accident.	Guide
2046	(January 21) UNSS Nautilus boosts out of Earth orbit for Tau Ceti.	Guide
2046	(February 21, speculative) UNSS Icarus launches for Alpha Centauri.	Guide
2046	(March 21, speculative) UNSS Hector launches for Arcturus.	Guide
2046	(April 21, speculative) UNSS Prometheus launches for Epsilon Indi.	Guide
2046	(May 5) UNSS Nautilus is damaged after hitting an object.	Guide
2049	The ’East’ orders 5 Keldysh class cruisers built, four which are ready by 2053, in time for World War III.	Guide
(before) 2053	UNSS Columbus is appropriated by the United States of America.	Guide
2053	Columbus is destroyed by an Econ kinetic-kill missile.	Guide
2053	World War III begins.	Guide
2055	Planned FTL experiments by the United States Air Force are canceled.	Guide
2058	The United States of America is building the first transorbital warships.	Guide
2060	The White Sands Spaceport is closed and heavy-lift capability ceases.	Guide
2061	First test of the continuum distortion superimpellor.	Guide
2062	The first Liberty class cruiser attains nominal drive capacity.	Guide
2063	(April 4) Zephram Cochrane breaks the light 'barrier.'	Guide
2063	(April 4) Vulcan scouts make first contact with Earth.	Guide
2064	The first Liberty class cruiser has its armament installation completed.	Guide
2064	Six new Liberty class hulls are orbiting Earth.	Guide
2064	SS Defiant & SS Valiant depart respectively for the upper & lower edges of the galactic disk.	Guide
2064	(November 5) The Phoenix warp engines are recovered from orbit.	Guide
2064	The ex-Seneca is towed to the (now-empty) Valiant berth, for transformation into the Bonaventure.	Guide
2064	(October) Jules Verne has first successful sublight test flight.	Guide
2065	The warp surveyor SS Leif Eirickson departs for 61 Cygni. (speculative year; assumes slightly faster than 1c)	Guide
2065	The Sparon-DeSota Treaty requires all armed spacecraft within 5,000 AUs of Sol to be crewed internationally.	Guide
2065	The Phoenix is retired.	Guide
2065	SS Defiant is believed to have destroyed by the Barrier Alliance in this year.	Guide
2065	(August 22) Construction starts on SS Conestoga, Earth’s first colonizer.	Guide
2065	(December 14) Jules Verne has first warp run outside Uranus orbit, achieving w1.02.	Guide
2066-2069	The Liberty class system defense cruisers are the primary line of Sol system defense.	Guide
2066-2069	Full pre-WWIII industrial capacity is achieved by Earth.	Guide
2067	(early March) SS Conestoga christened.	Guide
2067	(April 4) On the 4th anniversary of Cochrane’s flight, the SS Conestoga launches for Eta Cassiopeiae III, later to be named Terra Nova.	Guide
2069	The United Earth Defense Pact (UEDP) is formed, performing as the international space defense organization of Earth until 2089.	Guide
2070	51 Liberty class cruisers are in Sol space.	Guide
2071	SS Spirit, the next Conestoga colonizer, is completed.	Guide
2073	SS Leif Erickson makes contact with the Tellarites on 61 Cygni V, days before a Tellarite explorer/merchantman is intercepted by a task force in the vicinity of Neptune.	Guide
2073	By this year, more than 50 warp ships had departed the Sol system.	Guide
2073	SS Valiant encounters the galactic barrier and self-destructs.	Guide
2073	The Verne class cruiser, the first series-produced vessel, enters United Earth service.	Guide
2075	The 18th Verne class cruiser is built, with 16 interstellar missions for the class currently underway.	Guide
2076	(late year) SS Conestoga arrives in orbit of Terra Nova.	Guide
2077	USS Mercury & USS Banshee are lost to hostile actions by unknown forces (the first so lost).	Guide
2080	The Jovian moons of Ganymede and Europa have become important industrial and military assets.	Guide
2081	The colonists of Terra Nova, determined to be independent, threaten any future attempts by Earth to further settle the planet.	Guide
2081	Permanent human presences are established on Ganymede and Europa.	Guide
2084	The SS Leif Eirickson’s message of contact with the Tellarites reaches Earth.	Guide
2086	USS Fletcher explodes in a warp drive failure, ending the tri-nacelle arrangement and resulting in the Verne class being restricted (and re-designated) in a system-defense role.	Guide
2086	SS Ascender, the third Conestoga colonizer, reaches and settles 36 Ophiuci III.	Guide
2089	The United Earth Defense Pact is reformed as the United Earth Star Fleet (UESF); the new exploration mission is handled by the UESF's United Earth Space Probe Agency (UESPA).	Guide
2089	The Verne class cruisers have operational control turned over to the UESF.	Guide
2089	USS Scythe accidentally opens fire on USS Hammer & USS Emnity.	Guide
2090	(speculative) Verne class destroyers removed from active duty & delegated to training.	Guide
2090-2130	Messier class ships are used to explore outside the Sol system.	Guide
2091	The UESF Academy is founded, with Liberty class cruisers available as training vessels.	Guide
2091	The re-directed SS Spirit reaches and settles on Alpha Centauri A-II.	Guide
2091	The first major upgrade of the Messier class’ warp engines occurs.	Guide
2091	The original Hercules (Y-100) is fielded.	Guide
2093	By this year, six extra-solar colonies had been established.	Guide
2095	(speculative) Verne class decommissioned.	Guide
2096-2098	The first series of confrontations with the Kzintis.	Guide
2096-2099	The Hercules model Y-200 is bought by the UESF.	Guide
2098	The fourth Kzinti invasion fleet retreats.	Guide
2099	Type-III cargo modules are introduced by the Terran mining industry.	Guide

22nd Century

YEAR	EVENT	REF
2100	Twenty-five Messier class vessels have been constructed, by this year.	Guide
2103	(speculative) The Hercules model FY-500 is introduced.	Guide
2112	Roanoke-Gemini subclass is purchased with plasma cannons.	Guide
2115	The second major upgrade of the Messier class’ warp engines occurs.	Guide
2115	Zephram Cochrane’s team begins development of a new series of warp engine.	Guide
2119	Zephram Cochrane leaves Alpha Centauri for deep space and is never seen again.	Guide
2120-2129	The first mutual defense pacts between Alpha Centauri and resident Terran colonists are signed.	Guide
2123	DY-500s are being produced in large numbers.	Guide
2125	(speculative) The Phoenix warp engines are recovered and preserved at the Smithsonian.	Guide
2125	The Hercules model FY-500 is discontinued.	Guide
2132	The first offensive actions by the Romulans begin with an attack on the USS Balboa.	Guide
2132-2156	Phase I of the Romulan War: Romulan attacks against Terran (and others’) territories are conducted.	Guide
2134	The UESF calls for a new survey ship class.	Guide
2135	The third (and final) major upgrade of the Messier class’ warp engines occurs.	Guide
2136	Four parallel development lines emerge from the original Cochrane team.	Guide
2140	(October 5) The Daedalus is destroyed in a drive chain explosion at warp 4.	Guide
2142	(January speculative) The Fleet Logistics Division of the UESF is formed.	Guide
2142	(May) The Fleet Logistics Division orders the development of a large warp transport.	Guide
2142	(March speculative) Hulls capable of mounting w3 engines are developed.	Guide
2145	USS Horizon, first of the Daedalus class, is fielded.	Guide
2146	The PB-2 engines are given official clearance for w3 cruising.	Guide
2146	A convoy escorted by two Iceland class frigates is almost completely destroyed by a Romulan raiding party, though it is initially blamed on Nausicaans.	Guide
2147	Starbase One is declared operational.	Guide
2147	The construction of USS Enterprise begins.	Guide
2147-2159	About 400 ’Cochrane’ fighters are produced.	Guide
2149	The Nausicaan ’scare.’	Guide
2149	The USS Hopkins is lost to hostile action.	Guide
2150	The Gradualist Party wins power in the United Earth Senate.	Guide
2150	Seven more Hopkins class ships are fielded.	I-74
2150	(October) Test flights of USS Enterprise begin.	Guide
2151	(April 16) A Klingon courier crashes on Earth.	Guide
2151	The fate of the silent colony on Terra Nova is discovered by the survey cruiser USS Enterprise.	Guide
2151	USS Intrepid is the first Earth ship to report a Rihannsu (Romulan) raid, though the attacker of the SS Diana is unidentified at the time. The Intrepid’s evidence, however, is lost with the ship in the vicinity of Tau 1 Eridani.	Guide
2151	The Klingon 'incidents.'	Guide
2151	USS Enterprise encounters a Romulan patrol of Theta Eridani.	Guide
2152	(January 1) USS Carronade survives a Romulan attack on Defense Outpost 4.	Guide
2152	(speculative) The Upholder class USS Intrepid is named after the recently-lost Messier class ship of the same name.	Guide
2152	Phased particle beam weaponry and polarizable armor is introduced.	Guide
2153	The Xindi strike Earth.	Guide
2153	(speculative) Some Messiers are re-classified as Verdun attack cruisers.	Guide
2153	(speculative) Some Messiers receive a fourth warp engine upgrade.	Guide
2153	(May 25) USS Intrepid is involved in the first major Klingon confrontation, with three Birds of Prey.	Guide
2155	Starbase One is destroyed by a specific Romulan attack.	Guide
2156	Romulans begin to overtly attack some Earth colonies.	Guide
2156	USS Patton reports its own destruction by Romulan forces. The attack results in a declaration of war by Earth.	Guide
2156	Punitive actions begin against the Romulans.	Guide
2156	Full-scale war against the Romulans begins.	Guide
2156	Convoy tactics changed from ’constant escort’ to ’relay.’	Guide
2156-2157	(June to June) Six Mercury class ships are lost.	Guide
2156-2159	Phase II of the Romulan War: Romulans conduct offensive towards Earth and its allies.	Guide
2157	Fleet actions between the UESF and the Romulans occur, most notably near Gamma Tri.	Guide
2158	Major concern regarding a potential Romulan invasion of Sol space is entertained.	Guide
2158	It is discussed that almost 100 colonies and outposts may have to be abandoned, in order to consolidate a defense of Earth’s core resources.	Guide
2159	Three Messiers surprise & overrun a Romulan forward staging post in Sierra Sector.	Guide
2159	A UESF battle group locates and severely damages a Romulan fleet supply point.	Guide
2159-2160	(in the months before Cheron) Starbases Two & Three become operational.	Guide
2159-2161	Phase III of the Romulan War: the final attrition battles occur.	Guide
2160	The Romulan command post at Cheron is crippled.	Guide
2161	The final Romulan ’plunge’ at Alpha Omega B.	Guide
2161	(May 24) USS Cavalier is destroyed by a Romulan attack, after the cease fire.	Guide
2162	The last Messier, USS Braxton, is destroyed in a warp system failure.	Guide
2162	(January 21) USS Cavalier survivors are rescured from an M-class world.	Guide
2162-2164	The Tarn Conflict	Guide
2164	After re-analyzation of SS Tupac Amaru’s sensor data, the 2146 raid previously blamed on the Nausicaans is properly attributed to the Romulans.	Guide
2172	Dr. Helmut Kreutzer, aboard the surveyor USS Schliemann for a pre-colonization assessment mission, dates the planetwide ruins on planet 522-IV as over 7.5 billion years old.	Guide
2177	The last Hercules model is decommissioned.	Guide
2188	The sublight and low-warp versions of the DY series cease production.	Guide
2188	The USS Columbia is destroyed by a Klingon raid.	Guide
2190-2199	All but 10 Roanokes are withdrawn from service.	Guide

23rd Century

YEAR	EVENT	REF
2201	The re-settled Terra Nova colony thrives.	Guide
2209	The Conestoga reactor on Terra Nova is shut down.	Guide
2260-2269	The last nine of 10 Roanokes, used as navigation training vessels, are withdrawn from service.	Guide
2265	The USS Enterprise uncovers the fate of the SS Valiant.	Guide
2266	Khan Noonian Singh’s DY-100 is discovered in the Mutara Sector, 50 lightyears from Earth.	Guide
2279	USS Frost Ridge, the last of the Roanokes, is retired.	Guide
2285	The Ascender reactor on Terra Nova is shut down.	Guide
2291	The Spirit reactor on Terra Nova is shut down.	Guide

24th Century

YEAR	EVENT	REF
2347	The Cardassian War starts.	Dom, ?
2353	The Tholian War begins.	?
2354	The Taneko Fleet structure is introduced, as Starfleet reorganizes. (Year is speculative.)	?
2358	The Tzenkethi War starts.	Dom
2360	The Tholian War ends.	?
2362	The Tzenkethi War ends.	Dom
2365	The remains of Lt. Col. Richey, USAF, of Charybdis (TAU Three), are found on Theta 116-VIII by the USS Enterprise.	Guide
2366	The Cardassian War ends.	Dom, ?
2366	A joint UFP-Tarn survey of Torgu-Va finds descendents of the Tarn and humans (from the USS Verdun) still fighting.	Guide
2372	The Klingon Empire disolves the Khitomer Accords and declares war on the UFP.	Dom
2373	The Klingon War suddenly ends. (Early in the year)	Dom
2374	The Dominion War starts.	DS9, Dom, ?
2375	The Dominion War ends.	DS9, Dom, ?

References

Guide – Guide to the UFP Starfleet (electronic)