Higan

Higan  is a Buddhist holiday exclusively celebrated in Japan during both the Spring and Autumnal Equinox. It is observed by nearly every Buddhist sect in Japan. The tradition extends from mild weather that occurs during the time of equinoxes, though the origin of the holiday dates from Emperor Shomu in the 8th century.^[

http://en.wikipedia.org/wiki/Higan
Today is Autumnal Equinox day. The days are growing shorter day by day.