equinox

1. N-COUNT An equinox is one of the two days in the year when day and night are of equal length. 晝夜平分日; 指春分或秋分[oft supp N]

In the Chinese calendar, the Spring Equinox always occurs in the second month. 在中國(guó)歷法中，春分總是出現(xiàn)在二月份。