Ask HN: Is there a universal time measure to use as a spacefaring civilisation?
As I see it there are a couple of problems,
1. Once we colonise another planet our concept of time (e.g. days, years etc) will be different to that of life on earth due to the shift in a planets orbit. Presumably every planet would require it's own measurement of time e.g. a martian year so that those living there can keep time in relative terms. We'll want a universal time however to synchronise events in time across all of our colonies. This would be the easiest problem as we can base it off of earth time.
2. If we were to encounter intelligent extra terrestrial life then we would need to agree on a concept of universal time to explain the history of our/their planet & species.
Does an idea for this universal measurement of time currently exist? If not then how would you expect it to look?