Is the ancient people's birthday a solar calendar or a lunar calendar?

Bored and turned to this question, the best one turned out to be a wrong answer. Someone mentioned in the answer that the lunar calendar is a combination of the lunar calendar, the lunar calendar and the solar calendar.

The solar calendar is the solar calendar. It is a calculation method that the earth revolves around the sun for about 365.25 days a year, which is not a unique feature of the western calendar. The part of the solar calendar in the lunar calendar is 24 solar terms. It takes about 365.25 days from beginning of spring to the next beginning of spring. In ancient times, the Spring Festival was celebrated at the beginning of spring, and the beginning of a year was also at the beginning of spring. The first day of the first month is just called the first day of the New Year. The modern Gregorian calendar is pure Gregorian calendar, so the solar terms match the Gregorian calendar. For example, Qingming is near April 5.

The lunar calendar is the lunar calendar, with the moon circling the earth for about 30 days as a month. Therefore, the first day of each month in the lunar calendar is the new moon, and the fifteenth day of each month is the full moon. The modern western calendar has no characteristics of the lunar calendar. In fact, there is a difference of several days between the December of the lunar calendar and the solar calendar, so the corresponding dates of the lunar solar terms are different every year, and a leap month will be added every few years.

Back to the question, people in ancient times celebrated their birthdays. The Gregorian calendar is mainly for educated people. In a popular culture, fortune telling is one year old, which is based on the Gregorian calendar. For example, you were born on the sixth day after the Millennium, and you will be one year old on the sixth day after the Millennium next year. Therefore, the birthday of a cultural person is actually the birthday of the current Gregorian calendar.

So you will find that there is no date in the solar calendar, which is not convenient to remember, so rural areas and the like generally celebrate the lunar calendar, that is, the date of the month.