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About Seconds

The second (symbol: s) is the base unit of time in the International System of Units (SI)[1] and is also a unit of time in other systems of measurement (abbreviated s or sec;[2]) it is the second division of the hour by sixty, the first division by 60 being the minute.[3] 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).[4][5] Between 1960 and 1967, it was defined in terms of the period of the Earth's orbit around the Sun in 1900,[6] but it is now defined more precisely in atomic terms. Seconds may be measured using mechanical, electric or atomic clocks.
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