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Best 30 Second Hand Stores in Kirkwood, MO with Reviews The CIPM has adopted various second ary 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 f