In recognition of this anniversary, this paper provides a historical review of work conducted in the United States of America that contributed to the atomic definition of the SI second a half century ago. The current year (2017) marks the 50th anniversary of the first definition of the International System of Units (SI) second that was based on atomic transitions. The benefits of atomic timekeeping to modern society have been immense and many technologies that we now take for granted, such as global navigation satellite systems (GNSS), mobile telephones, and the "smart grids" that provide our electric power, depend upon atomic clock accuracy. Read more about working at Atomic Energy Education Society. The new definition meant that seconds were now measured by counting oscillations of atoms, and minutes and hours were now multiples of the second rather than divisions of the day. 10 Atomic Energy Education Society Reviews by current and past employees about salary & benefits work culture skill development career growth job security work-life balance and more.
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However, Career growth is rated the lowest at 3.8. This permanently changed in 1967, when the SI second was redefined as the duration of 9 192 631 770 energy transitions of the cesium atom. The overall rating of Atomic Energy Education Society is 4.4, with Job Security being rated at the top and given a rating of 4.5.
Before atomic clocks, the second was defined by dividing astronomical events, such as the solar day or the tropical year, into smaller parts.