Science ❯ Physics

Time Measurement

Atomic Clocks Chronobiology Daylight Saving Time Chronology Chronometry Atomic Physics Time Standards Leap Seconds Equation of Time Optical Lattice Clocks

15 ARTICLES

3h ago

Timekeepers Vote to End Leap Second and Adopt Leap Hour

Designed to protect modern digital systems from one‑second disruptions, the change shifts responsibility for long‑term alignment to scientists and legacy users.

3 ARTICLES

7h ago

World Timekeepers End Leap Seconds and Fix UTC as Continuous Atomic Time

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4 ARTICLES

4w ago

EU Clock-Change Overhaul Still Stalled as Europe Prepares to Switch Back on Oct. 26

5 ARTICLES

last yr.

EU Clock-Change Overhaul Stalled Again as October Switch Goes Ahead

3 ARTICLES

last yr.

Clock Change Dates Set: Spain Falls Back Oct. 26, U.S. on Nov. 2

3 ARTICLES

last yr.

Record-Short Days Renew Debate Over First-Ever Negative Leap Second

20 ARTICLES

last yr.

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

16 ARTICLES

last yr.

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

6 ARTICLES

last yr.

Scientists Confirm August 5 as Shortest Day of 2025, Eye Negative Leap Second

Time Measurement

Timekeepers Vote to End Leap Second and Adopt Leap Hour

World Timekeepers End Leap Seconds and Fix UTC as Continuous Atomic Time

Germany Returns to Winter Time on October 25, 2026

Germany and EU Set to Return to Winter Time on Night of October 24–25, 2026

Daylight Saving Ends in Parts of Australia as Clocks Turn Back One Hour

Germany Shifts to Summer Time as Clocks Jump One Hour

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

North America Moves to Summer Time as EU Readies Late-March Clock Change

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

Germany Switches to Summer Time Overnight March 28–29, 2026

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Time Measurement

NIST Restores U.S. Time After Colorado Outage Causes Microsecond Drift

Winter Solstice Arrives Sunday at 3:03 p.m. GMT, Marking Year’s Shortest Day

Germany Returns to Winter Time After Smooth Overnight Clock Change

EU Clock-Change Overhaul Still Stalled as Europe Prepares to Switch Back on Oct. 26

EU Clock-Change Overhaul Stalled Again as October Switch Goes Ahead

Clock Change Dates Set: Spain Falls Back Oct. 26, U.S. on Nov. 2

Record-Short Days Renew Debate Over First-Ever Negative Leap Second

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

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

Scientists Confirm August 5 as Shortest Day of 2025, Eye Negative Leap Second

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Time Measurement