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The CIPM has adopted various secondary representations of the second, based on a selected number of spectral lines of atoms, ions or molecules. A unit of angular measurement equal to 1/60 of a minute of arc. Sixty arc seconds constitute an arc minute; 60 arc minutes constitute an angular degree. One arcsecond of latitude at the earth's surface corresponds to a north-south distance of only about 31 m. The second is the International System of Units unit of time measurement. When atomic clocks were made, they became the basis of the definition of the second, rather than the revolution of the Earth around the Sun.

This resulted in adoption of an ephemeris time scale expressed in units of the sidereal year at that epoch by the IAU in 1952. This extrapolated timescale brings the observed positions of the celestial bodies into accord with Newtonian dynamical theories of their motion. In 1955, the tropical year, considered more fundamental than the sidereal year, was chosen by the IAU as the unit of time. The tropical year in the definition was not measured but calculated from a formula describing a mean tropical year that decreased linearly over time.

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Radiation of this kind is one of the most stable and reproducible phenomena of nature. The current generation of atomic clocks is accurate to within one second in a few hundred million years. Since 1967, atomic clocks based on atoms other than caesium-133 have been developed with increased precision by a factor of 100. Under the International System of Units, the second is currently defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. This definition refers to a caesium atom at rest at a temperature of 0 kelvins (−273.15 degrees Celsius; −459.67 degrees Fahrenheit) .

There are references to 'second' as part of a lunar month in the writings of natural philosophers of the Middle Ages, which were mathematical subdivisions that could not be measured mechanically. ˌsecond-ˈhand adjective previously used by someone else. Coming after, and at a more advanced level than, primary. A person who supports and helps a person who is fighting in a boxing match etc.