Is birthday based on the solar calendar or the lunar calendar?

Birthdays are generally better and more accurate than lunar calendars.

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Generally, birthdays are mainly based on the lunar calendar, because the tradition of China people is that birthdays are calculated according to the lunar calendar, and it is ok to have two birthdays according to the lunar calendar and the solar calendar. There is a difference between flat leap years in the solar calendar. If birthdays are calculated according to the solar calendar, people born on February 29 in leap years can only celebrate their birthdays once every four years. Besides, people in China can use the animal sign, so the lunar calendar is the best birthday.

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Because the solar calendar is calculated according to the revolution of the earth, there is a difference between a flat year and a leap year. Although there are clear rules in the solar calendar, if a person born on February 29 of a leap year celebrates his birthday according to the solar calendar, then this person can only celebrate his birthday once every four years, so it is best to celebrate his birthday according to the lunar calendar.

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In addition, many China people's animal signs and zodiac signs are mainly based on the lunar calendar. If there happens to be a year when the lunar calendar and the solar calendar meet, then people born here will have two completely different animal signs according to the lunar calendar and the solar calendar. Therefore, in order to avoid this situation, it is best to use the lunar calendar algorithm to celebrate birthdays.