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.Seasons have a big effect on things like the weather and plants' lifecycles.If one of them were to suddenly disappear...But there were originally four, weren't there?The world has three seasons - spring, summer, and winter.But now it's gone.There used to be a season considered Spring's counterpart.I can think of only one explanation for this discrepancy.SummerSpringWinterBut the day for the other equinox of the year is just treated as a normal day.Emperor's Birthday 11/03Harvest Festival 10/17Emperor Jimmu Memorial 04/03Festival of OriginVernal Equinox Festival (Setsubun) 03/20Empire Day 02/11Emperor Koumei MemorialNew Year's BanquetSetsubun falls on the equinox, when the days and nights are of equal length. Humans consider it a holiday.September 22nd is exactly six months after setsubun.