Tag: #timekeeping

International Timekeepers Vote to End Leap Second; Continuous UTC to Start May 20, 2027

Global metrology body votes to retire the leap second, moving civil time to continuous UTC with a one-hour maximum drift.

#timekeeping, #utc, #leapsecond, #bipm

Boulder team reports optical clock comparisons hitting 3.2×10⁻¹⁸ uncertainty, a milestone toward redefining the second

Researchers in Boulder compared three optical atomic clocks with uncertainties down to 3.2×10⁻¹⁸, meeting a benchmark for redefining the SI second.

#opticalclocks, #metrology, #timekeeping, #atomicphysics