NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sextant Accuracy and anomalous dip
From: Rodney Myrvaagnes
Date: 2003 Mar 23, 20:07 -0500
From: Rodney Myrvaagnes
Date: 2003 Mar 23, 20:07 -0500
On Sun, 23 Mar 2003 08:02:12 -0800, Walter Guinon wrote: >I think that ignoring the propagation time completely would introduce >negligible error in establishing GMT. e.g. the delay over 2000 nm would be on >the order of 20 milli-seconds. > It varies a lot for loaded delay lines, which a cable is. It isn't EM radiation in a vacuum, or anything like it. It is easy to measure with present-day equipment, as someone else mentioned, but they didn't have oscilloscopes and electronic oscillators at that time. Perhaps something like a doorbell buzzer. Michelson's measurement of C with whirling mirrors might lead the way to a measurement using the technology of the time. Rodney Myrvaagnes J36 Gjo/a "Never stand behind a sneezing cow." Michael Perry
