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Best 30 Second Hand Stores in Kirkwood, MO with Reviews This figure is sometimes rounded to 3 x 108 m, or 300,000 kilometers . This is easy to derive from the fact that there are 60 second s in a minute, 60 minutes in an hour and 24 hours in a mean solar day. Until modern times, degrees and hours were divided successively by 60 in pars minuta prima, pars minuta secunda, pars minuta tertia and so on. This evolved to the modern minute and second, but for smaller divisions we follow now the decimal division. In some languages, dictionaries still keep the word for third for 1/60 of a second, for example Polish and Arabic (ثالثة). 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.The ground state is defined at zero magnetic field. The factor of 60 comes from the Babylonians who used a sexagesimal (base-60) numeral system. However, the Babylonians did not subdivide their time