Answer: EQUINOX

AnswerCrossword Clue
EQUINOXSemiannual event.
equinoxthe time when the sun crosses the equator
equinoxone of the times when day and night are of equal length
EQUINOXTime between solstices
EQUINOXVernal, say
EQUINOXSemiannual event
EQUINOXFall time
EQUINOXOccasion at Stonehenge
EQUINOXMarch 21 occurrence
EQUINOXSeptember occurrence
EQUINOXBobtailed horse seen with steer, one day in March (7)
EQUINOXSeptember event
EQUINOXMarch or September event
EQUINOXMarch time
EQUINOXTime of year.
EQUINOXTime when day and night are the same length.
EQUINOXMarch 21 or September 23.
EQUINOXTime when sun's center crosses equator.
EQUINOXWhen night and day are of equal length.
EQUINOXSpring time
EQUINOXEvent heralding spring
EQUINOXMarch moment
EQUINOXTwice-yearly event
EQUINOXSemiannual astronomical event
EQUINOXVernal or autumnal occurrence
EQUINOXVernal or autumnal ...