Is time believed to be a constant or is it merely a function of the perception of the observer? My understanding is that if Astronaut Poole was just outside of an event horizon and Astonaut Bowman was just inside the event horizon, their repsective perceptions of time would be drastically different.(adsbygoogle = window.adsbygoogle || []).push({});

As such, is there any sort of objective measurement of time?

Further, is there some sort of scientific notation for time that indicates an oberver's viewpoint or some sort of notation for a theoretical "objective" time like a superscipt or subsciprt?

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# Relative time notation

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