#cosmic_time  the time covered by the physical formation and development of the universe
  supertype:  #time  the continuum of experience in which events pass from the future through the present to the past
  subtype:  #sidereal_time  measured by the diurnal motion of stars
     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:  #sidereal_year  the time for the earth to make one complete revolution around the sun, relative to the fixed stars
     subtype:  #sidereal_hour  1/24 of a sidereal day
     subtype:  #sidereal_month  period between successive conjunctions with a star, 27.322 days
  subtype:  #solstice  either of the two times of the year when the sun is at its greatest distance from the celestial equator
     subtype:  #summer_solstice__June_21__midsummer  June 21, when the sun is at its northernmost point
     subtype:  #winter_solstice  December 22, when the sun is at its southernmost point
  subtype:  #equinox  either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
     subtype:  #March_equinox__vernal_equinox__spring_equinox  March 21
     subtype:  #September_equinox__autumnal_equinox__fall_equinox  September 22

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