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Second - Wikipedia 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 Digital clocks and watches often have a two-digit seconds counter
Second - Simple English Wikipedia, the free encyclopedia In science, a second is the time it takes for a caesium atom to vibrate 9,192,631,770 (around 9 billion) times Scientists measure the second this way because the length of a day changes all the time
Second | Measurement, Timekeeping, Clock | Britannica The second was formerly defined as 1 86,400 of the mean solar day—i e , the average period of rotation of the Earth on its axis relative to the Sun In the mid-20th century this definition became inadequate because of the need for increased precision in timekeeping
What does Second mean? - Definitions. net The second is the base unit of time in the International System of Units and is also a unit of time in other systems of measurement it is the second division of the hour by sixty, the first division by 60 being the minute
Second: Introduction | NIST Atomic clocks enable us to define the second — the international unit of time — in a precise, measurable way that doesn’t change over time And they allow us to divide the second into extremely small parts, opening up new applications with each finer subdivision