In 1967 a new SI definition of a second was created based on
the radiation from the caesium-133 atom.
It is correctly defined as "the duration of 9,192,631,770
periods of the radiation corresponding to the transition between two hyperfine
levels of the ground state of the caesium-133 atom."
News:
USA & Canada clocks
on Daylight Saving Time until:
Sunday 4 November 2012 2am local time
Europe / UK clocks
on Summer Time until:
Sunday 28 October 2012 01:00 GMT
Australia clocks
on Standard Time until:
Sunday 7 October 2012 3am local time
