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Time & Calendars Lab
An authoritative scientific publication dedicated to the physics of time, atomic standards, astronomical synchronization, and global calendar evolutions.
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Did You Know?
The standard SI second is defined not by astronomical movements, but by the radiation corresponding to the transition between two hyperfine levels of the ground state of the Cesium-133 atom oscillating exactly 9,192,631,770 times.
SI Standard (BIPM)
Accuracy: 10⁻¹⁶
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