On 1/11/2013 9:02 AM, John Clark wrote:
On Fri, Jan 11, 2013 at Roger Clough <rclo...@verizon.net <mailto:rclo...@verizon.net>> wrote:


    > So either there's no ether, or light has a fixed velocity.


No, light has a fixed velocity with or without the aether, it's a experimental result not a theory.

It's not even that anymore, it's a convention. Since we use clocks to measure distances the speed-of-light is just a conversion factor now between length and time units:
299,792,458m/s notice that there is no experimental uncertainty.

Brent

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