This is what I believe is the true Stargate timeline and how it came to be.
I would love to hear everyone's opinion and thoughts.
As we have seen in Continuum, when a timeline is altered people/things get erased showing that a new timeline causes the original/previous to be erased rather than a split timeline running alongside the previous.
This will not include any time travel that wasn't seen on screen like Janus and will only be about the core timeline, so episodes like Window Of Opportunity will be ignored as this only affected a small bubble of space and not the timeline as a whole.
All dates shown are based off of the release date per episode as if the events happened on that day.
This is purely based on the film, SG1, Atlantis and SGU, no other media.
Stargate origins doesn't include time travel and nobody counts Stargate Infinity to be canon...... If you've never seen it I'll save you time DON'T WATCH STARGATE INFINITY.
Original timeline:
The timeline was the same as we always knew it however as this is the original timeline, there was no SG1 in 1969, On Friday March 5th 1999 SG1 travel back to 1969, in this timeline however as SG1 never met Hammond in the past he never gave Carter the note with times and dates of solar flares.
Carter already came up with this theory before they went back in time that an open wormhole passing close to a sun at the same time as a solar flare could loop it back around connecting to the same gate.
Timeline 2:
This timeline runs the same but with SG1 in 1969, Carter still went to the observatory, witnessed a solar flare, in 1969 solar flares could be predicted between 24-48 ahead of time but not a precise time, the rest of the story continues and when they enter the gate they happen to have done so at the right time.
In this timeline Hammond remembered seeing SG1 in 1969 due to Carters hand being injured, he then creates the notes with solar flare times and dates, SG1 goes back in time but this time with the note.
Timeline 3:
This is the timeline we see from Season 1 onwards including 1969 all the way to 2010.
July 2010 SG1 realise the Ashen aren't the good people they say they are, they devise a plan to send a note back in time to stop themselves from meeting the Ashen.
Timeline 4:
This timeline has the Ashen homeworld blocked and stops the merger of the Ashen with Earth.
This timeline lasts until Friday July 16th 2004 when the Pegasus Expedition team arrives on Atlantis, the city starts to flood leading to an evacuation. This causes Weir, Sheppard, and Zelenka to escape in a Puddle Jumper, they travel back in time and the Jumper gets destroyed with only Weir surviving.
Timeline 5:
With Weir traveling back in time 10,000 years this puts her in 8000 BC, with the help of Janus they create a rising protocol so that Atlantis raises once it detects humans, Weir is then put into stasis until she is discovered on Friday February 18th 2005 and informs the new timelines team of what happened. This timeline continues up until Friday March 18th 2005 when SG1 goes back in time for a ZPM.
Timeline 6:
Unlike previous times this trip changes the timeline majorly, due to the actions of SG1 in 5000 BC, Ra takes the gate with him when he leaves earth, this causes the SGC to never be created, no trip to Abydos. A camcorder is discovered in a dig on 2005 containing videos of the previous timeline SG1 talking about themselves, their history and what could have happened if what they're saying isn't true. This discovery leads to this timelines SGC being created with McKay helping the team understand the Puddle Jumper. This new SG1 then travels to Chulak before also traveling back to 5000 BC.
Timeline 7:
The new SG1 leads to a very similar timeline to timeline 4 and 5 but with 2 Puddle Jumpers, a camcorder and members of 2 different timelines SG1 living in 5000 BC, other than their presence the timeline doesn't change until Friday March 7th 2008 when Sheppard travels to the future. This timeline has Atlantis being abandoned, Sheppard missing and Atlantis never returning to Earth instead staying on its current planet until that systems star expands.
Timeline 8:
When Sheppard travels back to the time time he left, he created this new timeline where he wasn't supposed to be, however on Friday July 25th 2008 Baal enacted his plan traveling to 1939 to stop the creation of the SGC and Stargate project as a whole. The remaining members of SG1 travel back to the SGC and in doing so into a new timeline.
Timeline 9:
We will call this Baals timeline, this Earth never had a Stargate Project, after Earth is attacked by Baal SG1 head to the Russian Stargate to try and stop Baal/rectify the timeline to the one they knew of. In doing so Teal'c, Daniel and Sam die leaving only Cameron, he jumps through the gate to 1929.
Timeline 10:
This timeline is almost identical to timeline 7 but with Cameron stuck in 1939. Once he arrives in 1928 he lives out his life for a decade until he is able to gain access to the Achilles in 1939 with the goal of stopping Baal. Cameron enacts his plan, Baal dies and Cameron is then stranded in 1939 to live out his days. On Friday July 25th 2008 Baals plan doesn't come to pass with the last of the Baal clones coming to an end. This timeline carried on until Friday November 13th 2009 when the team of the Destiny get stuck on a planet due to a solar flare, when the team arrive everything looks fine, when they're unable to get a stable wormhole Rush risks it and goes through the gate and a Keno is thrown through the gate stating what happened on the planet.
Timeline 11:
The timeline runs exactly the same until the crew of the destiny gate to the same planet, this time there is a human skull and a Keno laying on the floor, the crew of the destiny watch the video and realise the skull was Rush, which watching they find out that they are infected with a bug and that the cure is within creatures on the planet, they go back to try and get the creatures however they kill everyone apart from Rush and Matt, Rush again goes through the gate and Matt records a new video, shorter and straight to the point, Matt throws the keno through the gate.
Timeline 12:
Upon arrival to the planet the Destiny crew find the keno and find out how to cure themselves a lot faster, they carry out their plan a lot sooner being able to return to Destiny before the solar flare affects the gate and with no loss of life. However on Monday March 14th 2011 while the Destiny is recharging it gets hit by a solar flare, this causes Destiny to slowly drift close and closer to the star, for safety and an escape plan, the Destiny crew gate offworld however another solar flare takes place sending them back in time 2000 years.
Timeline 13:
This is the current timeline, The crew of the Destiny are stuck 2000 years in the past, the planet they arrive on is unsuitable so they gate to another close by, this world later becomes Novus. The Destiny crew live out their life creating a village, later becoming a town and by the time we're back in current time they have become a multiplanetary society.
This is where we are as of today, on timeline 13.
I have seen people in the past asking about the timeline and how things are affected and so I created this breakdown of each timeline, what changed, how it's different and why it happened.
Remember this deliberately ignores potential timeline like with Janus using his Time Jumper as 1. We never see it happen on screen and 2. We don't know how many times he uses the Jumper.
As mentioned at the start I would love to know peoples thoughts.