Danny Mayer <ma...@ntp.org> wrote: > On 12/24/2011 8:10 PM, j...@specsol.spam.sux.com wrote: >> John Hasler <jhas...@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
How do you measure distance with an atomic clock? -- Jim Pennino Remove .spam.sux to reply. _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
