#year.time_period  the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun; "a Martian year takes 687 of our days"
  supertype:  #time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
  part:  #time_of_year
  subtype:  #anomalistic_year__anomalisticyear  time of the earth's revolution from perihelion to perihelion again; 365 days and 6 hr and 13 min and 53.1 sec
  subtype:  #solar_year__solaryear__tropicalyear__astronomical_year__equinoctial_year__equinoctialyear  the time for the earth to make one revolution around the sun, measured between two vernal equinoxes
  subtype:  #lunar_year__lunaryear  a period of 12 lunar months
  subtype:  #sidereal_year  the time for the earth to make one complete revolution around the sun, relative to the fixed stars

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