Second - Wikipedia
https://en.wikipedia.org/wiki/Second
OverviewUsesClocks and solar timeEvents and units of time in secondsOther units incorporating secondsTimekeeping standardsHistory of definitionFuture redefinitionThe second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as 1⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of Units (SI) is more precise:The second [...] is defined by taking the fixed numerical value of the caesium frequency, ΔνCs, t… Symbol: s
Symbol: s
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