[ntp:questions] Accuracy of NTP - Advice Needed

Danny Mayer mayer at ntp.org
Wed Dec 28 00:46:27 UTC 2011


On 12/24/2011 8:10 PM, jimp at specsol.spam.sux.com wrote:
> John Hasler <jhasler at newsguy.com> wrote:
>>> The open sky nearest the OPERA detector is straight up through 1400m of
>>> rock.
>>
>> Jim Pennino writes:
>>> And the easiest open sky to get to is horizontally down the tunnel to
>>> the entrance which is next to a freeway.
>>
>> Yes, the entrance is next to a freeway.  The entrance to the LNGS
>> facility where the OPERA detector is located is near the middle of the
>> 10 km long Gran Sasso highway tunnel.
> 
> The bottom line is that the only thing that is relevant is how easy it is
> to get to a GPS antenna with an open view of the sky.
> 
> Everything else is bloviation.

GPS is not used for this kind of thing, they are too inaccurate, so it
doesn't matter. They use atomic clocks.

Danny


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