[time-nuts] Accurate 1 pps signals

[J. Forster]

OK. Now someone start up a Time-Gnats or a Volts-Gnats List.

-John

=============


>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Mark Sims
>> Sent: Wednesday, August 19, 2009 8:56 AM
>> To: time-nuts at febo.com
>> Subject: [time-nuts] Accurate 1 pps signals
>>
>> Know where the heck you are down to a gnats ass and get that location
>> into the unit with full accuracy.   Errors in the saved antenna
>> position from its true position have a definite effect on the quality
>> of the output.  Ideally have the antenna location surveyed in WGS84
>> coordinates.
>>
>
>
> OK.. just what is a gnat's ass in actual SI units?
>
> It's small..
> Is it a standardized unit drawn from physiology (like the yard or foot,
> relative to King John's physical dimensions, or the cubit)
> Is it a traditional term for some other standard unit (e.g. a "barn" being
> 1E-24 cm^2 or a shake being 1E-8, both being from early nuclear weapons
> development, and essentially a rounded value for some useful size:
> cross-section for a nuclear reaction, and generation time for fission,
> respectively) (I understand from some casual googling that the gnat's ass
> is used by machinists to refer to a tenthousandth of an inch/tenth of a
> mil, although none of the machininsts I know use the term. They talk in
> tenths when being quantitative, and have somewhat earthier terms when
> talking qualitative)
>
> What I did find with google was interesting.. I didn't know that gnat's
> ass as a term for very small dated at least back to Aristophanes, although
> the lines 160-164 in Clouds are still qualitative, not quantitative
> (narrow, thin/subtle: stenos, leptos)
>
> Next up, we need to decide which species of gnat is being referred to..
>
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