On 2 Feb 2011 at 8:32, Gerard Ashton wrote:

> - the SI second is part of a coherent system of units and redefinition 
> of the second would
>    disturb the definition of most other units

You could have multiple types of seconds, like you have troy and 
avoirdupois ounces, and U.S. and imperial gallons.

NASA is already using a Martian second, based on subdividing the 
solar day of Mars, that is a different length from the SI or Earth 
rotation seconds.


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