Convert quarter (hour) to atomic clock period
Selected category: time.
Definition and details for quarter (hour):
Quarter is usually used as an informal unit of time equal to 1/4 hour or 15 minutes.
Definition and details for atomic clock period:
International System of Units (SI), in 1967 defined the second as the duration of 9,192,631,770 cycles of radiation corresponding to the transition between two energy levels of the caesium-133 atom.