On 1/30/2020 5:37 PM, Alan Grayson wrote:
On Thursday, January 30, 2020 at 6:29:18 PM UTC-7, Alan Grayson wrote:
On Thursday, January 30, 2020 at 5:09:56 PM UTC-7, Brent wrote:
On 1/30/2020 12:45 PM, Alan Grayson wrote:
That's not it. I think the two observers, one in a galaxy far
removed and one here, would read the same CMBR "time",
regardless of the distant galaxy's speed of recession. But
relativity says otherwise. This is what puzzles me. AG
Ask yourself /*when*/ do they read the same time.
Brent
I don't know if this helps. Since the temperature of the CMBR is
the same everywhere, at any time t, we can in principle determine
if the two measurements are simultaneous or not. AG
But regardless of simultaneity or not, there's no dilation of this
clock! (And AE doesn't say what a clock is.) What the hell is going
on? AG
The clocks used in relativity examples are the whatever the most perfect
and stable clock in existence are (in this case cesium atom clocks).
They always measure proper time thru spacetime. The only reason that
when compared they seem to register different durations is because they
traveled different paths thru spacetime and these paths had different
proper length. "Time dilation" is not some function of the clock...it's
a function of the path the clock is measuring. Remember my odometer
analogy?
Brent
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