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.
Harvest festival In Britain, thanks have been given for successful harvests since pagan times. Harvest festival is traditionally held on the Sunday near or of the Harvest Moon. This is the full Moon that occurs closest to the autumn equinox (22 or 23 September). The celebrations on this day usually include singing hymns, praying, and decorating churches with baskets of fruit and food in the festival known as Harvest Festival, Harvest Home, Harvest Thanksgiving or Harvest Festival of Thanksgiving.