Joe Reid wrote: "Since 1799 the metre has not been based on the distance from the north pole to the equator."
That depends entirely on one's perspective. >From a historical perspective, it has always been based on that distance. (Why else would the meter of today be so close in length to the original meter?) It's just that the parameters used to define it more precisely no longer make any reference to its origin. Bill Potts, CMS Roseville, CA http://metric1.org [SI Navigator]
