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Every year around mid-end of September, in time with the autumn equinox in the Northern Hemisphere, Japan observes a national holiday called Autumnal Equinox Day (秋分の日). This day has been a public holiday since 1948, and it actually celebrates more than just the changing of the seasons. Here’s the things you may want to know about Japan’s Autumnal Equinox Day!

What exactly does “Equinox” mean?

The word equinox comes from Latin and means ‘equal night’ – however, the lengths of day and night on the equinox days are almost “equal”. The first equinox of the year occurs in March and is called the Vernal Equinox. This day indicates the end of winter and the start of spring. Japan also celebrates the vernal equinox with a national holiday, Vernal Equinox Day (“Shunbun no Hi“, 春分の日).

In the Northern Hemisphere, the second equinox of the year is known as the Autumn Equinox. It usually occurs between the 22nd and the 23rd of September, when the sun passes over the equator from the Northern Hemisphere to the Southern Hemisphere. This day indicates the end of summer and the start of autumn. This year (2022), it will occur on the 23rd of September at 10:04 am (JST).

History of a Holiday

Japan has actually celebrated the equinoxes for centuries. But rather than just acknowledging the changing of the seasons, the roots of this holiday in Japan are actually believed to come from Shintoism and Buddhism. The equinoxes were originally holidays called Kōreisai (皇霊祭) in Japan.

The two Kōreisai holidays, the Shun-ki Kōreisai (春季皇霊祭) in Spring, and the Shūki Kōreisai (秋季皇霊祭) in Autumn, occurred every year on the equinoxes. They were actually a Shinto holiday observed to honor past emperors up until 1947. But in 1948, thanks to Japan’s post-war constitution separating religion and state, the Shūki Kōreisai was changed …continue reading