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So if sometime in the future, a pregnant human left Earth (say, through MuskTech's wormhole), and gave birth on a world orbiting Proxima Centauri, Earth's regi

So if sometime in the future, a pregnant human left Earth (say, through MuskTech's wormhole), and gave birth on a world orbiting Proxima Centauri, Earth's registrar shouldn't record it without adding an additional 4.3yrs? And when should the family back home celebrate? Defining the actual timing of events based on the presently available methods to perceive or communicate them seems odd if not also a bit impractical.

delecti 4y ago
Coordinating events as precise as births in a multiplanetary society is already going to be inherently impractical. The family back home should celebrate when it's relevant. If there's a wormhole, then the kid can probably make a call through it, so they can call on their (self-perceived) birthday. If the wormhole is a one-way trip, then the people back home should wait an additional 4.3 years to celebrate, because they won't have any idea until then.