what is the date of the autumnal equinox
Equinox An equinox is commonly regarded as the moment in which the plane of Earth's equator passes through the center of the Sun's disk,[2] which occurs twice each year, around 20 March and 23 September. This simplified, but incorrect, understanding of Earth's orbital motion can lead to errors of up to 69 seconds from the actual time of equinox.
School holidays in the United States Most colleges and universities divide the school year into two semesters. The fall semester often begins the day after Labor Day in early September and runs until mid-December. The spring semester typically starts in the middle or end of January and runs until May. Winter and summer classes might be offered in January and Mayâ€“August.