Science ❯Physics

Timekeeping

Atomic Clocks Pulsar-Based Timekeeping Clocks Standards Nuclear Clocks Optical Atomic Clocks Earth's Rotation International Time Standards Coordinated Universal Time (UTC) Precision Timing Leap Seconds

Largest Global Optical Clock Comparison Paves Way to Redefine the Second

The campaign demonstrates that optical clocks can be synchronized with unprecedented precision for an updated definition of the SI second.

Breakthrough in Nuclear Clock Technology Promises Unmatched Precision

Astronomers Use Pulsars to Detect Potential Dark Matter

New Discoveries on HD 189733b Reveal Extreme Conditions and Unusual Atmospheric Composition

Global Warming May Delay Introduction of First-Ever Negative Leap Second