http://www.gcmap.com/mapui?P=lga-lhr
-- kris On Oct 2, 2010, at 7:31 AM, Jon Meek wrote: > One of the ways that I have tormented WAN vendors over the years is > with a plot of RTT vs. great circle distance between the end points of > a circuit. Most RTTs usually sit at some constant offset above that > Physics limit straight line. Circuits taking a less than ideal have > their RTT far above the Physics limit line and we have used that > information to get routes fixed. > > Using my great circle program that accounts for the non-spherical > Earth for locations we have West of London and North of NYC, assuming > a 1.5 index of refraction I get: > > One way distance: 5520.6 km Round Trip Delay: 55.2 ms > > So Heath's estimate is right on, although depending on where he got > the distance maybe it does account for the shape of the Earth. > > Jon > > On Sat, Oct 2, 2010 at 6:17 AM, Heath Jones <hj1...@gmail.com> wrote: >> On 2 October 2010 10:52, Rod Beck <rod.b...@hiberniaatlantic.com> wrote: >>> Is that a straight line calculation or did you take into account that a >>> straight line is not the shortest path on a curved surface? >> >> Well that is pretty obvious to most, but no - I didn't go to the >> effort of factoring in curvature of the earth - especially given that >> 1.5 is very rough figure anyway for RI of glass. If anything, my >> comment was compliment to your network being close to minimum possible >> latency! >> >> >