Most people like Chinese birthdays. What's the difference between the lunar calendar and the solar calendar?

The lunar calendar does not consider the movement of the earth around the sun, so the changes of the four seasons in the lunar calendar have no fixed time and cannot reflect the seasons, which is a great shortcoming. In order to overcome this shortcoming, people later decided on a compromise calendar, the so-called yin-yang calendar. The summer calendar still in use in China (some people call it lunar calendar or lunar calendar) is this kind of lunar calendar. Like the lunar calendar, it also customizes a month according to the time when the moon is full and short, which is 30 days for the big month and 29 days for the small month. However, it also adopts the method of adding leap months to make the average number of days in each year close to the number of days in the solar calendar to adjust the four seasons. Every two or three years, there will be an extra leap month in the summer calendar. The lunar calendar, also known as the lunar calendar, takes the moon's orbit around the earth as one month and the earth's orbit around the sun as one year, which is actually equal to the lunar calendar. This calendar was adopted in China before the first year of the Republic of China, so it is called the old calendar. Most people think that the lunar calendar is suitable for farmers, and the name of this day is "Lunar Calendar".