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ᱫᱷᱟᱹᱲ ᱑᱐:
==ᱵᱟᱨᱦᱮ ᱡᱚᱱᱚᱲ==
{{wiktionary|second}}
{{commons}}
* [https://web.archive.org/web/20160407215419/http://www.npl.co.uk/science-technology/time-frequency/research/optical-frequency-standards/trapped-ion-optical-frequency-standards National Physical Laboratory: ''Trapped ion optical frequency standards'' ]
* [http://resource.npl.co.uk/docs/networks/time/meeting3/klein.pdf ''High-accuracy strontium ion optical clock''; National Physical Laboratory (2005)]
* [https://web.archive.org/web/20080314011450/http://inms-ienm.nrc-cnrc.gc.ca/research/optical_frequency_projects_e.html#optical National Research Council of Canada: ''Optical frequency standard based on a single trapped ion'']
* [http://physics.nist.gov/cuu/Units/second.html NIST: ''Definition of the second''; notice the cesium atom must be in its ground state at 0 K]
* [http://www.bipm.org/en/publications/si-brochure/second.html Official BIPM definition of the second]
* [http://www.cl.cam.ac.uk/~mgk25/time/metrologia-leapsecond.pdf The leap second: its history and possible future]
* [http://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q10 ''What is a Cesium atom clock?'']
* [http://www.astronoo.com/en/articles/measuring-time.html Accuracy of the time — Astronoo]
==ᱥᱟᱹᱠᱷᱭᱟᱹᱛ==
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