That’s a complicated story…I started this project well before Sound and Silence was created, with an Excel spreadsheet and a lot of best guesses, lots of lookups to keep X, Y and Z related, and a huge margin of error, 10% here, 30% there. So there were places where a given event could have occurred some 100 years off my estimated date. Ultimately, Radio Free Deimos’s timeline became the backbone for the canon timeline in Sound and Silence, with a fair amount of modification and correction, but most of the dates stayed more or less intact. When HSD 2.0 was created, it had an entirely new way of looking at dates, which gave suggestions of at least what century some events occurred in, and a clearer dating of key events (the story of Genotype, in particular). This helped clarify some of the timeline, fix some order issues, and otherwise gave a real shakedown to my first estimates of the dates…and it showed more clearly what the narrative timeline should have been.
In a sense, there’s three different histories — 1.0’s hazy narrative, Sound and Silence’s timeline, and 2.0’s 100-year-marker version, and the S&S timeline is a best-guess effort at sequencing 1.0, made without the clearer picture of 2.0. This current version of “The Timeline of Everything is essentially the S&S timeline, corrected whenever possible to fit with the date ranges in 2.0.