A widow's year is when there is no "start of spring" in the whole year, which happens seven times in 19 years. For example, 1991 year of the sheep, 1994 year of the dog, 1997 Year of the Ox, 1999 Year of the Rabbit, 2002 year of the horse, 2005 year of the Rooster, 2008 year of the Rat, 2010 year of the Tiger, 2013 Year of the snake, 2016 Year of the Monkey, 2019 Year of the Pig, 2021 Year of the Ox, 2024 Year of the Dragon, 2027 Year of the Goat... And so on are "no spring" years.
"Widow's year" does not refer to which years, but refers to all the years that do not "start of spring", the south called it "blind year", the north called "widow's year". Experts say that the "widow's year" is just a coincidence between the lunar calendar and the solar calendar, and the start of spring is only caused by the time difference between different calendars, which does not affect the cycle of four seasons and does not affect personal life.
More than 2,000 years ago, China had the method of "seven leap months in nineteen years", that is, seven leap months are inserted in 19 years, so that the lunar leap year has 383 or 384 days, about 19 days more than the year in the solar calendar.
The Spring Festival is basically scheduled to be around February 4 in each Gregorian calendar year, so that every lunar leap month there are two beginning of spring, and some ordinary years there is no beginning of spring. The rule of "single spring" also roughly follows a 19-year cycle.
That is to say, there will be seven years out of every 19 years without the start of spring, and there will be an average of once in two or three years. There were also seven "double spring years" and five "single spring years" during these 19 years.
It can be seen that "no spring" after "double spring" is completely the result of the calendar arrangement according to a certain law, and it often appears.