September 22nd is exactly six months after setsubun.Setsubun falls on the equinox, when the days and nights are of equal length. Humans consider it a holiday.Festival of OriginNew Year's BanquetEmperor Koumei MemorialEmperor Jimmu Memorial 04/03Empire Day 02/11Vernal Equinox Festival (Setsubun) 03/20Harvest Festival 10/17Emperor's Birthday 11/03But the day for the other equinox of the year is just treated as a normal day.I can think of only one explanation for this discrepancy.Seasons have a big effect on things like the weather and plants' lifecycles.WinterThere used to be a season considered Spring's counterpart.SpringSummerIf one of them were to suddenly disappear...But now it's gone.The world has three seasons - spring, summer, and winter.But there were originally four, weren't there?The scenery around us would change, too. It would skip ahead to the next one. It's no wonder everyone feels as if something is missing.