#March_equinox__vernal_equinox__spring_equinox  March 21
  exclusion:  September_equinox
  supertype:  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
  part of:  springtime__spring  the season of growth; "the emerging buds were a sure sign of spring"; "he will hold office until the spring of next year"

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