[LEAPSECS] LEAPSECS Digest, Vol 51, Issue 23

[Gerard Ashton]

On 2/7/2011 2:49 PM, Tony Finch wrote:

> On Mon, 7 Feb 2011, Finkleman, Dave wrote:

>

>> This discussion exposes the fact that we don't all have to work in the

>> same reference frame or time system - as long as we understand what we

>> are using and make it clear to users.

> Though the whole point of universal time is that it's the default timscale

> for civil use and only specialists should need anything else.

>

> Tony.


Many units are derived from the second. While I might be interested in 
reporting
the time of day of an event in UTC, I will make virtually all other 
measurements,
such as current, force, mass, and length, in units derived from the SI 
second as
it exists in my reference frame. If I carry out a precision realization 
of any of the
other units, the SI second in my reference frame will follow, even if I 
don't have
an atomic clock.

Gerry Ashton