'The most recent of these devices can achieve accuracy to within about 1 second in every 3 million years'
an atomic clock
CLEANING YOUR CLOCK: The most recent of these devices can achieve accuracy to within about 1 second in every 3 million years
The most recent of these devices can achieve accuracy to within about 1 second in every 3 million years
The most recent of these devices can achieve accuracy to within about 1 second in every 3 million years
CLEANING YOUR "CLOCK"
an atomic clock
CLEANING YOUR "CLOCK"