Ina recent update on Sen no Kiseki’s website, Falcom has added a timeline to it. The above image from the timeline also confirms that this takes place between Zero no Kiseki and Ao no Kiseki.
For the most part, this timeline states basic plot items that are already known, except for a couple. As I understand that people wish to avoid spoilers, there are the usual warnings for continuing on with this post if you’ve only played Trails in the Sky and wish to remain unspoiled.
| Year | Event | ||
| 952 | The Imperial Lion’s War ends. Prince Dreikers [ed: ??] becomes Emperor. | ||
| 1154 | C. Epstein dies in the Leman region | ||
| 1157 | The Zeiss Central Factory is opened by Albert Russell under the original name of Zeiss Technology Workshop | ||
| 1162 | Alicia II becomes queen at 20 years old | ||
| 1173 | Zeiss Central Factory is established | ||
| 1187 | Passenger Ship Eterna sinks at sea. Judas, the crown prince of Liberl, and his wife are killed in the accident | ||
| 1190 | The Epstein Foundation and the Zeiss Central Factory together announce the idea of the Orbal Network | ||
| 1192 | The Hundred Days War breaks out between the Liberl Kingdom and the Erebonia Empire | ||
| 1197 | Rean becomes a student of Yun Kafei | ||
| Joshua is adopted by the Bracer Cassius | |||
| 1198 | Bracer Cassius Bright is promoted to S Rank | ||
| 1199 | The twin rail cannons at Galeria Fortress are deployed | ||
| 1201 | Guy Bannings is killed while investigating a case. | ||
| Lloyd Bannings is sent to live with relatives in the Calvard Republic | |||
| 1202 | The Imperial Chapters of the Bracers Guild are attacked simultaneously | Sora no Kiseki FC — Trails in the Sky |
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| The airship Linde goes missing. | |||
| Apprentice Bracers Estelle and Joshua Bright set off on their journey from Rolent | |||
| The festival in the Liberl Kingdom to celebrate the queen’s 60th birthday | |||
| The Liberl Kingdom enters a peace treaty with three nations. | Sora no Kiseki SC | ||
| 1203 | The incident with the Orbal Suppression Phenomenon occurs in the Liberl Kingdom | ||
| Girias Osborne, Prime Minister of Erebonia, has his audience with Queen Alicia II in Liberl | Sora no Kiseki the 3rd | ||
| The Jaegar band, Red Constellation, enters the Calvard Republic and has a large scale conflict with Heiyue | |||
| Kevin Graham and Ries Argent recover the artifact called the Arca of Recluse in Liberl | |||
| 1204 | The Special Support Section is founded within the Crossbell Police Department | Zero no Kiseki | |
| Class VII is founded within the Thors Military Academy |  |
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| The Crossbell State celebrates its 70th anniversary of its founding | |||
| The Jaegar band, Red Constellation, enters Crossbell | Ao no Kiseki | ||
| The West Zemuria Trade Conference is held in the Crossbell State | |||