Which solar term is behind the Millennium?

The solar term after the Millennium is the autumnal equinox. The autumnal equinox has two meanings: First, the sun reaches the ecliptic 180. , 24 hours a day, each 12 hours; Secondly, according to the method of seasonal division in ancient China, which took beginning of spring, Changxia, beginning of autumn and beginning of winter as four seasons, the autumnal equinox lived in autumn for 90 days and divided the autumn equally.