Calendars are divided into lunar and solar calendars, so a person has two birthdays. Besides the date of birth, are there any overlapping dates?

According to the calendar arrangement of Gregorian calendar and lunar calendar, the leap month of lunar leap year is calculated as one leap every three years, two leap every five years, six five four three eight +09 seven leap; The lunar calendar basically takes 19 as a cycle, corresponding to the same time in the Gregorian calendar.

However, the size of the lunar month is very irregular, sometimes two, three, four big months or two three small months are connected together, and the length of the calendar year varies greatly. The distribution dates of solar terms and gas in the lunar calendar are very unstable and vary greatly. In this way, the lunar calendar seems very complicated. In fact, the lunar calendar still has a certain cyclical law: because the number of days in the 19 tropic year is almost equal to that in the 19 lunar year, every 19 lunar year is almost the same. Every nineteen years, the Gregorian calendar days on the first day of each month in the same month of the lunar calendar are generally the same or one or two days apart. Every nineteen years, solar terms and neutral dates generally repeat, with individual differences of one or two days. The months separated by 19 leap month are repeated or differ by one month. At the same time, the leap year of Gregorian calendar, such as 2000, is also a normal year, so it is one day less than the normal year 19.

Therefore, the solar calendar and lunar calendar we usually see are repeated every 19 years, but some people repeat at 19 years old, do not repeat at 38 years old, or 19, 38 years old. It's not surprising that I don't repeat it at the age of 57. Life is only a hundred years, just like our life passed a special time adjustment point in the Gregorian calendar in 2000, and most people's repetition may have changed. Check the perpetual calendar by yourself to see if your birthday repetition has changed.