Science ❯ Physics

Timekeeping

Atomic Clocks Leap Seconds Precision Timing Standards Clocks Variations in Time International Time Standards Optical Clocks Coordinated Universal Time (UTC) Optical Atomic Clocks

14 ARTICLES

yesterday

First Operational Nuclear Clocks Built by Teams in Vienna and Beijing

They open a route to timekeeping beyond atomic clocks by driving a thorium-229 nuclear transition while still depending on improved crystals and stronger ultraviolet lasers.

7 ARTICLES

2w ago

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

18 ARTICLES

2y ago

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

Timekeeping

First Operational Nuclear Clocks Built by Teams in Vienna and Beijing

Singapore Lab Builds World's Most Accurate Lutetium Atomic Clock

Germany Sets Clocks Forward to Summer Time on March 29

Germany Sets Clocks Forward to Summer Time on March 29

China’s Strontium Optical Clock Hits Redefinition Threshold for the SI Second

IRNSS-1F Clock Failure Leaves NavIC Below Minimum for Navigation

Germany Sets Clocks Forward to Summer Time on March 29, 2026

Earth Sets Second-Shortest Day of 2025 as Spin Continues to Accelerate

Earth Logs 1.34-Millisecond Day, Its Second-Shortest on Record

Largest Global Optical Clock Comparison Paves Way to Redefine the 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