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- Second abstract "The second (symbol: s) is the base unit of time in the International System of Units (SI)and is also a unit of time in other systems of measurement (abbreviated s or sec); it is the second division of the hour by sixty, the first division by 60 being the minute. Between AD 1000 (when al-Biruni used seconds) and 1960 the second was defined as 1/86,400 of a mean solar day (that definition still applies in some astronomical and legal contexts). Between 1960 and 1967, it was defined in terms of the period of the Earth's orbit around the Sun in 1900,but it is now defined more precisely in atomic terms. Seconds may be measured using mechanical, electric or atomic clocks.Astronomical observations of the 19th and 20th centuries revealed that the mean solar day is slowly but measurably lengthening and the length of a tropical year is not entirely predictable either; thus the sun–earth motion is no longer considered a suitable basis for definition. With the advent of atomic clocks, it became feasible to define the second based on fundamental properties of nature. Since 1967, the second has been defined to be:the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.In 1997, the CIPM affirmed that the preceding definition "refers to a caesium atom at rest at a temperature of 0 K."SI prefixes are frequently combined with the word second to denote subdivisions of the second, e.g., the millisecond (one thousandth of a second), the microsecond (one millionth of a second), and the nanosecond (one billionth of a second). Though SI prefixes may also be used to form multiples of the second such as kilosecond (one thousand seconds), such units are rarely used in practice. The more common larger non-SI units of time are not formed by powers of ten; instead, the second is multiplied by 60 to form a minute, which is multiplied by 60 to form an hour, which is multiplied by 24 to form a day.The second is also the base unit of time in the centimetre-gram-second, metre-kilogram-second, metre-tonne-second, and foot-pound-second systems of units.".
- Second thumbnail Flashingsecond.gif?width=300.
- Second wikiPageExternalLink 10.
- Second wikiPageExternalLink optical.
- Second wikiPageExternalLink second.html.
- Second wikiPageExternalLink klein.pdf.
- Second wikiPageExternalLink second.html.
- Second wikiPageExternalLink metrologia-leapsecond.pdf.
- Second wikiPageExternalLink server.php?show=ConWebDoc.1086.
- Second wikiPageID "26873".
- Second wikiPageRevisionID "604158201".
- Second hasPhotoCollection Second.
- Second note "Common prefixes are in bold".
- Second symbol "s".
- Second unit "second".
- Second subject Category:Centimetre–gram–second_system_of_units.
- Second subject Category:Orders_of_magnitude_(time).
- Second subject Category:SI_base_units.
- Second subject Category:Units_of_time.
- Second comment "The second (symbol: s) is the base unit of time in the International System of Units (SI)and is also a unit of time in other systems of measurement (abbreviated s or sec); it is the second division of the hour by sixty, the first division by 60 being the minute. Between AD 1000 (when al-Biruni used seconds) and 1960 the second was defined as 1/86,400 of a mean solar day (that definition still applies in some astronomical and legal contexts).".
- Second label "Second".
- Second label "Seconde (temps)".
- Second label "Seconde".
- Second label "Secondo".
- Second label "Segundo".
- Second label "Segundo".
- Second label "Sekunda".
- Second label "Sekunde".
- Second label "Секунда".
- Second label "ثانية".
- Second label "秒".
- Second label "秒".
- Second sameAs Sekunda.
- Second sameAs Sekunde.
- Second sameAs Δευτερόλεπτο.
- Second sameAs Segundo.
- Second sameAs Segundo.
- Second sameAs Seconde_(temps).
- Second sameAs Detik.
- Second sameAs Secondo.
- Second sameAs 秒.
- Second sameAs 초_(시간).
- Second sameAs Seconde.
- Second sameAs Sekunda.
- Second sameAs Segundo.
- Second sameAs m.06nxt.
- Second sameAs Q11574.
- Second sameAs Q11574.
- Second wasDerivedFrom Second?oldid=604158201.
- Second depiction Flashingsecond.gif.
- Second homepage second.html.
- Second isPrimaryTopicOf Second.
