Accuracy freaks

[takashi78]

Look at this, the NIST-F1 clock would neither gain nor lose a second in 60 million years !!! 

NIST-F1 is a caesium fountain atomic clock in the National Institute of Standards and Technology (NIST) in Boulder, Colorado, and serves as the United States' primary time and frequency standard. The clock took fewer than four years to test and build, and was developed by Steve Jefferts and Dawn Meekhof of the NIST physics lab.

The clock replaces NIST-7, a cesium beam atomic clock used from 1993 to 1999. NIST-F1 is ten times more accurate than NIST-7. NIST-F1 will be replaced by the NIST-F2.

Similar atomic fountain clocks, with comparable accuracy, are operated by other time and frequency laboratories, such as the Paris Observatory and the Physikalisch-Technische Bundesanstalt in Germany.
[edit] Accuracy

As of summer 2005, the clock's uncertainty was 5 x 10-16. It would neither gain nor lose a second in 60 million years.

http://en.wikipedia.org/wiki/NIST-F1

[besview]

This is for accuracy freaks!!

[takashi78]

Haha but did you read my post correctly, yours still +2s
But the NIST-F1 clock would neither gain nor lose a second in 60 million years!

[besview]

Thats coz its at that position.After wearing it for a week,its +1..Gravity rules here.How the watch is stored after a day at the office has a bearing on gain/loss.The most consistent I've had is all of my sports Rollies..ExpII,GMT II, subs in that in watever position the gain/loss is almost spot on. Means gravity and storage position has minimal effect  on timekeeping and thats a mark of a good movement

The NIST-F1 clock is a different beast altogether.The above is more down to earth for us mortals

[kenixck]

i was once told that atomic casio g-shocks won't re-calibrate itself if you are outside of USA by a watch dealer.
but this might be off-topic a bit.