Ready to search for the perfect pumpkin and apple cider doughnut as the September air turns cooler and the leaves turn colorful? The official start of the fall season of 2022 is almost here. This year, autumn begins at 9:04 p.m. on Thursday, Sept. 22, in the United States and the rest of the northern hemisphere, because that’s the date the autumn equinox arrives as our weather transitions from summer to fall. (On the southern side of our planet, the seasons are changing from winter to spring.) What is the autumn equinox? The autumn equinox — also known as the autumnal equinox, the fall equinox…