Science ❯ Physics ❯ Time Measurement

Atomic Clocks

Leap Seconds Precision Timing Microseconds Precision Timekeeping Coordinated Universal Time Influences on Time Precision Technology GPS Technology Signal Transmission Time Standards Impact of Earth's Rotation Caesium Clocks Discrepancy with Astronomical Time

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

A generator failure during a utility shutoff caused the microsecond drift, now corrected.

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

New Projections Confirm Record-Short Days This July and August

Earth's Spin Breaks Short-Day Records as Timekeepers Halt 2025 Leap Second