... prefix 2n 30 : a node whose identifier has prefix 30 n 31 :a node whose identifier has prefix 31 n 33 :a node whose identifier has prefix 33 n 32 0: a node whose identifier has prefix320n 32 2: a ... defined the second to be the time ittakes the cesium 133 atom to make exactly 9,192, 631 ,770 transitions. The choiceof 9,192, 631 ,770 was made to make the atomic second equal to the mean solar second ... anything to do with papal decrees and did notaccept the Gregorian calendar for 170 years.Figure 6 -3. TAl seconds are of constant length, unlike solar seconds. Leapseconds are introduced when necessary...