3 ms·
Some atomic clocks are considerably less accurate. I can't find a citation, but IIRC, older cesium atomic clocks are accurate to about 1 second every 300 years.
by MichaelDickens 13y ago
Some atomic clocks are considerably less accurate. I can't find a citation, but IIRC, older cesium atomic clocks are accurate to about 1 second every 300 years.