Birthday is a solar term.

Of course, according to the zodiac sign of the old yellow calendar, the calculation should start from "beginning of spring", and the traditional horoscope of numerology also starts from "beginning of spring". In other words, beginning of spring is the beginning of a year.

The lunar calendar in China is a kind of "yin and yang calendar", that is, based on the sun and the moon, the 24 solar terms reflect the cycle of the sun. The first and fifteenth days reflect the cycle of the moon. Before the Revolution of 1911, the first day of the Lunar New Year was called "New Year's Day" and beginning of spring was called "Spring Festival".

After the Revolution of 1911, the government of the Republic of China announced the abolition of the lunar calendar and the adoption of a new calendar (Gregorian calendar). From 19 12, the Gregorian calendar 1 is called "New Year's Day". 19 14 1, the government of the Republic of China issued a decree to change the name of Lunar New Year's Day to "Spring Festival", which has been used ever since.