course credit credit hour credit

work unit heat unit energy unit

charge unit ampere-minute quantity unit

30 minutes hr unit of time hour 60 minutes time unit

school year session academic term school term academic session academic year

period time period period of time

30 minutes min unit of time quarter man hour half-hour mean solar day twenty-four hour period 24-hour interval quarter-hour minute twenty-four hours solar day person hour hr 15 minutes day 60 minutes time unit sidereal hour

gloaming nightfall daybreak sunup closing time sundown first light midday dayspring clock time fall dawning morning aurora happy hour crepuscle bedtime break of day early-morning hour rush hour sunset cockcrow mealtime small hours time high noon twelve noon sunrise noon evenfall zero hour dusk none gloam time of day noontide twilight noonday midnight crepuscule dawn break of the day canonical hour late-night hour

period time period period of time

distance minute