An indispensable part of the World Building process for an epic fantasy world or Space Opera universe is a timeline showing when all the events described in the stories and back stories happen, and how many days, months and years pass between them. They go nicely with a Fantasy World Map, and often make appearances in Universe Compendiums and Universe Concordances. See also The Trope History of the Universe. And check out our Grand Unified Timeline. Examples of Universe Chronology include: