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Second: The marketplace solution to sell services online 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) . Improve your vocabulary with English Vocabulary in Use from Cambridge. Learn the words you need to communicate with confidence. A type or grade of college degree granted according to a student's performance on specific written and oral ex