Vernal Equinox Day, known as Shunbun no Hi, is a public holiday in Japan that takes place on the day of the spring equinox, which happens around March 20th or 21st each year. The holiday celebrates the arrival of spring and has been a part of Japanese culture since the eighth century. Apart from signifying the change of the seasons, the holiday also encourages people to be in harmony with nature and living beings.

On Vernal Equinox Day, many Japanese people traditionally visit their family graves to respect their ancestors. It's also commonplace to hold reunions with family members, a significant cultural aspect in Japan. Additionally, this holiday offers a chance to enjoy unique seasonal foods and visit shrines or temples. Some places in Japan also hold cherry blossom viewing parties as this is the season when these beautiful trees begin to bloom.

Whilst Vernal Equinox Day has deep traditional roots and customs, it's also seen as a time to reflect on oneself in the contemporary world. It's associated with the idea of new beginnings as nature comes back to life after winter. In recent years, the holiday is also being celebrated by enjoying the warming weather, admiring the onset of vibrant spring flowers, and generally enjoying the beauty of nature in Japan.