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You have three issues to solve: There are two different worlds. The sequential nature of each world's chapters (that there are not gaps where the other world's chapters are). The two timelines ru...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/43611 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43611 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You have three issues to solve: 1. There are two different worlds. 2. The sequential nature of each world's chapters (that there are not gaps where the other world's chapters are). 3. The two timelines run simultaneously (vs one being a flashback or something). I would solve 1 and 2 the same way: with a clear calendar system for each world that is different enough to show that they aren't different dates in the same system but totally different calendars. For example: - World 1: July 27, 3009. - World 2: The 18th day of the 3rd month in the reign of Kala year 47. Number 3 is a lot harder and the solution will need to revolve around the shared character. This isn't hard to do...it's hard to do well. Drop hints, show the character's thoughts if narration allows, or he can speak about the transition. Do this subtly but more than once. It's easy for a reader to miss a single reference, but multiple references will get their attention. If the mission is the same or related, this may be the best way to make things clear.