Sonija
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Sonija (ar. ثانية; işorai bajnalmillī: s) — vohidi cenkuniji vaqt ki şastjak hisai daqiqaro taşkil mekunad, jake az vohidhoi asosiji bajnalmilliji tartibi CGS.
Nigared[viroiş]
Sarcaşma[viroiş]
- National Physical Laboratory: Trapped ion optical frequency standards
- High-accuracy strontium ion optical clock; National Physical Laboratory (2005)
- National Research Council of Canada: Optical frequency standard based on a single trapped ion
- NIST: Definition of the second; notice the cesium atom must be in its ground state at 0 K
- Official BIPM definition of the second
- Seconds and leap seconds by the USNO
- The leap second: its history and possible future
- What is a Cesium atom clock?
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