When is the Millennium?

The Millennium usually falls from September 7th to 9th in the Gregorian calendar, which is the third solar term in autumn. Twenty-four solar terms are determined according to the position of the sun on the ecliptic, and the longitude of the sun's arrival 165 is one thousand years. The time of the Millennium is not fixed. For example, the Millennium of 20 19 is September 8, and the Millennium of 2020 and 202 1 is September.