Tom, here is some useful info from S&T. http://www.skyandtelescope.com/community/skyblog/observingblog/15772912.html You could also check out the A.L.P.O. website: http://alpo-astronomy.org/ Check out their lunar section. On Thu, Apr 3, 2014 at 9:19 PM, Thomas Sevcik <sfv1ts@hotmail.com> wrote:
The NIST-F2 is stated to be accurate to within one second in 300 million years! Now if they'd only come out with digital watches to come close to matching that. Does this put amateur crater immersion and emersion timings for the next series of lunar eclipses a thing of the past? (apparently my computer's dictionary doesn't know how "emersion" is spelled). I would presume that if one is recording the eclipse on video it would be best to record the atomic clock signal from Denver via a external microphone for accuracy?
http://www.nbcnews.com/science/science-news/new-super-accurate-atomic-clock-... Tom Sevcik