Which number on the calendar is the birthday?

People in China generally have two birthdays: the lunar calendar and the solar calendar.

Gregorian birthday is the date indicating the year of birth, that is, the date indicated by the numbers on the calendar. Lunar birthday date refers to the corresponding date number below the solar calendar date of the year of birth. Generally speaking, the older generation of China people celebrate their birthdays in the lunar calendar, but now more and more people use the solar calendar, such as the registration of newborns and the birth date of the college entrance examination. Birthday is just a representative. You can celebrate your favorite birthday, but generally you can't use both dates. If you meet a leap year in the lunar calendar, you usually celebrate your birthday on the first date.

The lunar calendar is a calendar in which the moon orbits the earth once (taking the sun as a reference, the actual moon orbits more than one week), that is, the first month of the lunar calendar is the basis for determining the calendar months, and a year is twelve calendar months.

The calendar based on the apparent movement of the sun is referred to as "solar calendar" or "solar calendar" for short; The moon is "lunar calendar", and the calendar based on the apparent motion law of the moon is called "lunar calendar" for short.

The lunar calendar determines the moon according to the law of its movement: the orbit of the moon is called the white road, and both the white road and the ecliptic road are two great circles on the celestial body, which intersect at five degrees and nine minutes. The moon goes around the earth once and appears on the ecliptic twice. The calendar on the 27th is 7 hours and 43 minutes 1 1.5 seconds. This day is called "Stellar Moon". Only when the moon revolves around the earth, the position of the earth changes, counting forward more than 27 degrees, and the moon runs at the speed of 13 degrees 15 minutes every day, so it takes 29 days 12: 44: 2.8 to return to the moon. This is called "the first moon", which is called a month by custom, meaning

[Edit this paragraph] China calendar

Because the new moon is easier to observe than the tropic of cancer, almost all ancient calendars are lunar calendars. Because it takes 365 days for the earth to revolve around the sun once, but only about 354 days in the twelve months of the lunar calendar, the ancients solved this problem by adding leap months. The calendar of our country has been a kind of yin-yang calendar since ancient times. Because the first day of each month is a new moon and the fifteenth day is a full moon, it is easy to identify and use, so it is usually called the lunar calendar. Until today, because the changes of solar terms in the calendar are closely related to agricultural planting activities, the "Lunar Calendar" plays an important role in the lives of China people, especially farmers.