This year's Setsubun falls on February 3rd, but next year it will be moved one day earlier to February 2nd due to changes in the calendar due to factors such as the relative position of the Earth and the sun.
"Setsubun" is said to be the day before "Risshun," but in next year's "calendar guidelines" published in the official gazette this month, "Risshun" is set to be February 3rd due to the positional relationship between the earth and the sun. ``Setsubun'' falls on February 2nd, one day earlier than usual.
There are 365 days in a year, but because the period in which the Earth revolves around the sun is slightly longer than 365 days, the time at which the Earth reaches the designated "first day of spring" shifts slightly every year.
In the current calendar, we basically set a ``leap year'' every four years to compensate for the deviation, but it still doesn't eliminate it completely, so next year's ``First Spring'' will be brought forward by one day, and ``Setsubun'' will also be postponed. It means it's early.
"Setsubun" will return to February 3rd the year after next, but it will move one day earlier more frequently toward the end of this century, with approximately 30 years later, in 2057 and 2058, it will fall on February 2nd for two consecutive years. It is a trend.
In 2021, when "Setsubun" was moved one day earlier, some calendars incorrectly listed February 3rd as "Setsubun," and a person in charge of the National Astronomical Observatory's Calendar Calculation Office said, A certain 'Setsubun' is determined by the movement of the earth and the sun, so it is normal for the time to move.Next year, the date will change, so please be careful.''