Spring Equinox is the fourth solar term among the 24 solar terms, arriving between March 19 and 22 every year. The term "Equinox" implies the "equal division of a season". Traditionally, the period between the solar terms "Beginning of Spring" and "Start of Summer" is considered as spring, and Spring Equinox falls right in the middle of these two solar terms, exactly dividing the spring season into two equal parts.