(November 12, 2014 at 4:28 pm)lifesagift Wrote: For me, the notion of a day is Earthbound. Calling the rotational period of any other planet around a star, a day. It's a bit like calling that star a Sun ! Wrong!
And if you hypothetically, were to sit in the middle of space, between galaxies, how would you measure time? Maybe by counting distance per heartbeat? but what if you passed close to a black hole?
But there's certainly no night and day if you aint orbiting a star.
That's exactly why I said I'm using human terms; days are a subjective subdivision of time, but they are equally as valid as any other subdivisions us humans care to define.
And according to relativity, every subdivision is equally relative, too.
In the middle of space, I'd imagine that counting the vibrations of a crystal -- or an atom -- would work as well as it does on Earth.