sumo#time_measure
  supertype:  pm#time_measure (pm)  sumo#constant_quantity
  subtype:  dl#temporal_quality__TQ  e.g., a date or a duration, but not its measure/value
     subtype:  dl#Temporal_location__TL
  subtype:  dl#temporal_region__TR  a value for a temporal quality, e.g., 24/5/2002, 2 seconds
     subtype:  dl#time_interval__T
        subtype:  pm#unit_of_time_duration  the class of all unit of measures used to measure time, e.g., minute, second, hour, etc.
           subtype:  #time_unit__unit_of_time  a unit for measuring time periods
              subtype:  #day__meansolarday__twenty-four_hours__solar_day  time for Earth to make a complete rotation on its axis; "two days later they left"; "they put on two performances every day"; "there are 30,000 passengers per day"
              subtype:  #night.time_unit  the dark part of the diurnal cycle considered a time unit; "three nights later he collapsed"
              subtype:  #mean_time__mean_solar_time  (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)
              subtype:  #terrestrial_time__terrestrialtime__tt__terrestrial_dynamical_time__terrestrialdynamicaltime__TDT__ephemeris_time__ephemeristime  (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
              subtype:  #month  a time unit of 30 days; "he was given a month to pay the bill"
                 subtype:  #lunar_month__moon__lunation__synodic_month__synodicmonth  the period between successive new moons (29.531 days)
                 subtype:  #anomalistic_month  period between successive perigees; approximately 27.5546 days
                 subtype:  #sidereal_month  period between successive conjunctions with a star, 27.322 days
                 subtype:  #solar_month__solarmonth  one-twelfth of a solar or tropical year
              subtype:  #sidereal_day__day  the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
              subtype:  #ship's_bell__bell  (nautical) each of the eight half-hour units of nautical time signaled by strokes of a ship's bell; eight bells signals 4:00, 8:00, or 12:00 o'clock, either a.m. or p.m.
              subtype:  #hour__hr__60_minutes  a period of time equal to 1/24th of a day; "the job will take more than an hour"
                 subtype:  #sidereal_hour  1/24 of a sidereal day
                 subtype:  #man_hour__manhour__personhour  a time unit used in industry for measuring work
              subtype:  #half-hour__30_minutes  a half of an hour
              subtype:  #quarter-hour__quarterhour__15_minutes  a quarter of an hour
              subtype:  #minute__min  a unit of time equal to 60 seconds or 1/60th of an hour; "he ran a 4 minute mile"
              subtype:  #quarter.time_unit  a unit of time equal to 15 minutes or a quarter of an hour; "it's a quarter til 4"; "a quarter after 4 o'clock"
              subtype:  #second__s____sec  1/60 of a minute; the basic unit of time adopted under the System International d'Unites
                 subtype:  #leap_second  a second (as measured by an atomic clock) added to or subtracted from Greenwich Mean Time in order to compensate for slowing in the Earth's rotation
              subtype:  #millisecond  one thousandth of a second
              subtype:  #attosecond  one quintillionth of a second; one thousandth of a femtosecond
              subtype:  #femtosecond  one quadrillionth of a second; one thousandth of a nanosecond
              subtype:  #picosecond  one trillionth of a second; one thousandth of a nanosecond
              subtype:  #nanosecond  one billionth of a second; one thousandth of a microsecond
              subtype:  #microsecond  one millionth of a second; one thousandth of a millisecond
           instance:  akts#time-measure-second__timemeasuresecond__second  akts#time-measure-minute__minute  akts#time-measure-hour__hour  akts#time-measure-day__day  akts#time-measure-month__month
        subtype:  sumo#time_duration  any measure of length of time, with or without respect to the universal timeline
           instance:  akts#twentyfour-hour-duration__24_hour_duration  akts#seven-day-duration__sevendayduration__7_day_duration__7dayduration  akts#twentyeight-day-duration__twentyeightdayduration__28_day_duration  akts#twentynine-day-duration__29_day_duration  akts#thirty-day-duration__30_day_duration  akts#thirtyone-day-duration__thirtyonedayduration__31_day_duration  akts#twelve-month-duration__12_month_duration
        subtype:  dl#date
     subtype:  sumo#time_position  any time_point or time_interval along the universal timeline from negative_infinity to positive_infinity
        subtype:  sumo#time_interval  a time_interval has both an extent and a location on the universal timeline; a time_interval has no gaps, i.e. this class contains only convex time intervals
           subtype:  akts#Day
           subtype:  akts#Week
           subtype:  akts#Month
           subtype:  akts#Year
        subtype:  sumo#time_point  the time_points at which processes occur can be known with various degrees of precision and approximation, but conceptually time_points are point-like and not interval-like; that is, it doesn't make sense to talk about how long a time_point lasts
           subtype:  akts#Calendar-Date  a point in time 

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