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When is the birthday of the old calendar and the birthday of the new calendar coincident?

Most people's birthdays in the lunar calendar and the solar calendar will coincide at 19, 38, and 57 years old. Because in 2009, 65438+7 leap. Theoretically, every 19 cycle, the dates of the solar calendar and the lunar calendar will appear on the same day. This is because 19 tropic year and 235 lunar months are basically equal. But sometimes there will be a day difference, which is related to the size setting of the new moon. However, it seems that many friends who celebrate their birthdays after 10 are only one day away. Therefore, it is normal for the lunar birthday to coincide with the solar birthday. It has no effect on the fortune of the year.