Quantum redactiones paginae "Secundum" differant

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[[Fasciculus:E. Mathey-Tissot minute-repeater, c. 1909.jpg|thumb|[[Horologium]] mechanicum cum facie parva ad secunda numeranda]]
'''Secundum''' {{victio|Secundus|i|n}}, aliquando '''''sec.''''' abbreviatum, signo [[Systema Internationale|Systematis Internationalis Unitatum SystematisMensurarum]]{{dubsig}} (SI) '''''s,''''' est [[unitates mensurae|unitasmensura]]{{dubsig}} [[tempus|temporis]], etprimaria [[Primavel SI Unitas|primaaxiomatica unitas]]{{dubsig}} temporis hoc in systemate.<ref name="BIPM21">
{{cite web
|title=Official BIPM definition
|url=http://www.bipm.org/en/si/si_brochure/chapter2/2-1/second.html
|publisher=[[BIPM]]
|accessdate=2008}}</ref> Per conventum atomicum, secundum correspondetest tantistempus 9&thinsp;192&thinsp;631&thinsp;770 periodorumcyclorum radiationis [[lux|luciselectron]]um undarumquae qua potimur ex transitionemovent inter duos gradus hypersubtiles status fundamentalis [[atomus|atomi]] [[Caesium|Cs]] 133.<ref>[http://www.bipm.org/en/si/ Bureau International des Poids et Mesures.]</ref> Homines eum [[horologium|horologio]] metiri possunt.
==Multiplices SI==
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In antiquitate [[Isaacus Newtonus|Newtoni]], divisus temporis erant annus, mensis, dies, hora, minutum primum, et minutum secundum; quaeque hora divisa erat in 60 ''minuta prima'' et quisque minutum primum in 60 ''minuta secunda.''
<ref>
Vide etiam historia vocabuli ''secundum'' in pagina Anglice [[en:second|pagina Anglica]]: "Originally, the second was known as a "second minute", meaning the second minute (i.e. small) division of an hour. The first division was known as a "prime minute" and is equivalent to the minute we know today."
</ref>
Anno 1687 [[Isaacus Newtonus|Newtonus]] in sua ''Principia''<ref>