The most obnoxious problem resultant from interstellar travel is humanity's need for a nuanced and contextual language to describe time. The most common solution is to define three types of standard years (8760 hours on a radioactive clock). Most star systems use a local standard year (LSY), 8760 hours spent moving at the speed of galactic expansion in a specific location other than Earth. A lived year is 8760 hours experienced by a person, and Earth standard year (ESY) is 8760 hours on Earth. Thus, when discussing age one might be 75 years old but born 750 ESYs ago.
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? Responses (4)-4
Physics is hard!
Age might be measured in proper time (https://en.wikipedia.org/wiki/Proper_time), whereas the suggested EST and LST sound good for deciding when (and where) to meet for events.
For some reason I find the idea of EMT across the universe based on Greenwich amusing.
See the Forever War where such distinctions become critical.
Interesting, and relevant in a space campaign. There is also the effect of time dilation, prominent in both Ender's Game and Interstellar.
3/5 Sold bit of sci fi ,commenting challange