Event Brief
Mar 21, 2026 at 3:04 AM ET
China's New Optical Clock Redefines Timekeeping
By The BriefBrief
A strontium optical clock developed in Hefei could redefine the second, losing or gaining less than one second over 30 billion years.
WHO: Pan Jianwei
WHAT: Development of a new optical clock
WHEN: Mar 21, 2026 at 2:00 AM ET
WHERE: Hefei
WHY: To join the global top-tier timekeeping club and redefine the second.
How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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