![]() ![]() ![]() Analog clocks and watches often have sixty tick marks on their faces, representing seconds (and minutes), and a "second hand" to mark the passage of time in seconds. The second (symbol: s, also abbreviated: sec ) is the base unit of time in the International System of Units (SI) ( French: Système International d’unités), commonly understood and 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. ![]() A pendulum-governed escapement of a clock, ticking every second ![]()
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