π―π΅ Japan
Autumnal Equinox Day marks the September equinox in Japan, a public holiday for honoring ancestors and welcoming autumn. Because the date depends on the exact moment the sun crosses the equator, it falls on either September 22 or 23 and is confirmed by the government the year before.
On the day itself, many people visit family graves to clean them and pay respects, and some call at temples or shrines as part of Higan, the Buddhist observance surrounding the equinox. Others mark the change of season by enjoying the harvest and eating botamochi, a sweet rice ball coated in red bean paste. Because the date is tied to the astronomical equinox rather than a fixed calendar day, it can fall on either September 22 or 23, and schools, offices, and most businesses close for the holiday.
Autumnal Equinox Day exists because of a deliberate break with Japan's prewar past. Until 1947, the same date marked ShΕ«ki kΕreisai, a Shinto ceremony honoring the spirits of past emperors as part of state-sponsored religion. When Japan's postwar constitution separated religion from government in 1948, the imperial rite was replaced by a secular public holiday centered on nature and family rather than the imperial household. The change let the day keep its meaning as a moment for remembering the dead and appreciating the turn of the seasons, while removing its status as an official state religious observance tied to the emperor.
Even without its original religious framing, the day continues to matter because Higan-week grave visits remain one of the most widely kept family traditions in Japan, observed by people who may not consider themselves religious. Falling at the natural turn from summer into autumn, the holiday also gives an entire country a shared, unhurried pause tied to the season rather than to a fixed calendar date, which keeps it feeling distinct from Japan's other public holidays.
Because the exact instant of the equinox shifts slightly each year, Japan's government doesn't officially fix the following year's holiday date until an astronomical almanac announcement the previous February.
Autumnal Equinox Day is one half of a pair with Vernal Equinox Day each March, Japan's two seasonal-turn holidays. Compared with fixed-date holidays like New Year's Day, the equinox pair stands out as one of the few places where Japan's holiday calendar bends to an astronomical event rather than a set date or a historical anniversary.
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