Wakati : Tofauti kati ya masahihisho

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Mstari 35:
Katika vipimo sanifu vya kimataifa sekunde imewekwa kama muda wa radidi (periodi) 9,192,631,770 za [[mnururisho]] wa [[atomi]] ya [[caesi]] ya <sup>133</sup>Cs.
 
Kisayansi [[Saa (ala)|Saa]] dio chombo maalum hutumka kupima wakati hasa saa za kronogilafia ''(chronograph watches) -'' saa zijulikanazo kwa Kingereza kama ''"Stop-Watch"'' za kupimia mda mfupi wakati tukio kama shindano la riadha zinafanyika.<ref>{{Cite Web|url=https://greatwatches.nyc/watch-type-list/|title=Watch Types|author=Great Watches NYC|date=|language=en-US|accessdate=13 July 2018|work=Great Watches NY Website}}</ref>
 
== Vipindi vya wakati ==
* [[milenia]] = miaka 1000