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What are the national holidays in Japan?

There are 15 nationill holidays determined by law.
When a holiday falls on a Sunday, the following Monday substitute for the holiday.

New Year's Day (January 1)
many offices are closed from the last day of the year through January 4.

Coming-of-Age Day (Second Monday of January)
A day to celebrate the coming of age of anyone who has turned 20 in the previous year.

National Foundation Day (February 11)
The day of the first Emperor Jinnu's enthronement, as written in the Nihon shoki.
The dale is based on the solar calendar.

Vernal Equinox Day (Around March 21)
The day when the sun passes the vernal equinox.
It is a day to celebrate nature and all living things.

Greenery Day (April 29)
The late Emperor Showa's birthday.
After his death, it was designated as a day for preserving Japan's greenery.

Constitution Day (May 3)
A day to commemorate the enactment of the Constitution of Japan in 1947.

National Holiday (May 4)
It was decided that this day should be a national holiday because it is between May 3, Constitution Day, and May 5, Children's Day.

Children's Day (May 5)
A day to hope for the health and happiness of children.
It used to be called tango no sekku, a day of celebration for boys only.
Carp-shaped streamers are flown on this day.

Marine Day (Third Monday of July)
A day to thank the sea for its blessings.

Respect-for-the-Aged Day (Third Monday of September)
A day to show particular respect for the elderly, enacted in 1966.

Autumnal Equinox Day (Around September 23)
The day when the sun passes the autumnal equinox.
It is a day to remember the dead and to show respect to one's ancestors.

Health-Sports Day (Second Monday of October)
Enacted in 1966 in commemoration of the opening of the 1964 Tokyo Olympics, it is a day to promote health.

Culture Day (November 3)
A day to promote the cultural prosperity of Japan, in commemoration of the day when the Constitution of Japan was promulgated in 1946.

Labor Thanksgiving Day (November 23)
A day to appreciate labor and to celebrate a good harvest.
It used to be called niiname-sail, when new crops were offered to the gods with gratitude.

The Emperor's Birthday (December 23)
The current Emperor's birthday.
It will continue to be celebrated as long as the Emperor is alive.