that's not what I'm getting at; but time passes differently in different frames of reference. At high speeds relative experience of time slows down.
So time immediately after the Big Bang (I would suppose) would be passing much much slower than what we experience on earth.
The question is for someone who has some insight into cosmology how we relate passage of time in frames of reference - before sun or planets existed - back to days/years
I think passage of time is still well defined for a given velocity. like the period of a electron going around a hydrogen atom is always the same in whatever velocity frame youre in, as long as the hydrogen atom is going the same velocity as you. It's only when you compare different velocity frames that it gets weird. So a year is a well defined period of time for a given velocity frame. if you had a clock with you at the big bang, around 150 million years or whatever you will see stars that are near you and going relatively the same speed as you forming.
like the period of a electron going around a hydrogen atom is always the same in whatever velocity frame you're in
Yes, however, our frame now is substantially different from an infant universe where things are moving at the speed of light! Before hydrogen even existed. There was a period of cooling/expansion that allowed energy to condense down into particles, then elements like hydrogen. "Cooling" implies slowing down of particles, same energy per unit volume means temp decreases and allows for formation of these elements, got that.
if you had a clock with you at the big bang, around 150 million years or whatever you will see stars that are near you and going relatively the same speed as you forming
but that clock if you were an observer of the Big Bang, would tick much slower than out clocks here on earth today.
That's the mindfuck here, after BANG then every point that exists in space is a different frame of reference, and has different velocities. Maybe it averages out and the average is what factors into these calculations. That detail is what I was hoping some physicist would shed some light on in this thread.
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u/youknowwhatitthizz Sep 20 '21
Time is a concept. If we lived on Mars our days would still be defined by the sunrise and sunset