1 Cycle per Day: A period of 1 day is equal to 1/86400 Hertz frequency. Period is the inverse of frequency: 1 Hz = 1/86400 cpd or approximately 0.000011574074074074 cpd. 1 Cycle per Hour: A period of 1 hour is equal to 1/3600 Hertz frequency. Period is the inverse of frequency: 1 Hz = 1 ...