1988 What day is February 5th in Gregorian calendar?

It can be seen that it is the eighteenth day of the twelfth lunar month of 1987.

Lunar calendar is one of the traditional calendars in China, also known as lunar calendar, lunar calendar, ancient calendar, Han calendar, yellow calendar, summer calendar and old calendar. The lunar calendar is not a pure lunar calendar, but a combination of yin and yang. Taking the change period of the moon phase as the month length, adding the "24 solar terms" component of the dry calendar, and taking the length of the solar tropical year as the year, the average calendar year is adapted to the tropical year by setting leap months. The lunar calendar is a calendar based on the lunar calendar (summer calendar) and combined with the solar calendar. Therefore, strictly speaking, the lunar calendar in China should not be called the lunar calendar, but a combination of yin and yang.

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 those moons that appear on the ecliptic twice. The calendar on the 27th is seven hours, 43 minutes and 11: 30, which 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

Different from the solar calendar, the first month, winter month and twelfth month in the lunar calendar are pronounced separately.

References:

Baidu encyclopedia-lunar calendar