Types of time and calendar

Gregorian calendar (Gregorian calendar) is a common calendar in most countries in the world, which was revised from "julian calendar". Julian calendar is the calendar decided by Julius Caesar, commander-in-chief of ancient Rome in 46 BC.

The solar calendar is a calendar based on the movement of the earth around the sun. It takes one revolution of the earth around the sun as a year. The length of a tropical year is 365.2422 days, that is, 365 days, 5 hours, 48 minutes and 46 seconds. In four years, there are 23 hours 15 minutes and 4 seconds, which is roughly equal to one day, so every four years, 1 day is added, and 366 days are obtained at the end of February, which is a leap year. But four years plus 1 day actually adds 44 minutes and 56 seconds to the tropical year. When the product reaches 128, one more day is counted, that is, 400 years is counted as three more days.

traditional Chinese calendar

Lunar calendar, one of the traditional calendars in China, is also called lunar calendar, lunar calendar, ancient calendar, yellow calendar, summer calendar and old calendar. Lunar calendar is a combination of lunar calendar and lunar calendar. On the one hand, the moon moves around the earth as a "moon", and the average length of the moon is equal to "Shuowangyue", which is the same as the lunar calendar principle, so it is also called "lunar calendar"; On the other hand, the "leap month" is set to make the average length of each year as close as possible to the tropic year, and the 24 solar terms are set to reflect the changing characteristics of the seasons, so the lunar calendar combines the characteristics of the yin-yang calendar, which is also called the "yin-yang calendar". Today, almost all Chinese in the world, as well as countries such as the Korean Peninsula and Vietnam, still use the lunar calendar to calculate traditional festivals such as Spring Festival, Mid-Autumn Festival and Dragon Boat Festival. Lunar calendar, one of the traditional calendars in China, is also called lunar calendar, lunar calendar, ancient calendar, yellow calendar, summer calendar and old calendar. Lunar calendar is a combination of lunar calendar and lunar calendar. On the one hand, the moon moves around the earth as a "moon", and the average length of the moon is equal to "Shuowangyue", which is the same as the lunar calendar principle, so it is also called "lunar calendar"; On the other hand, the "leap month" is set to make the average length of each year as close as possible to the tropic year, and the 24 solar terms are set to reflect the changing characteristics of the seasons, so the lunar calendar combines the characteristics of the yin-yang calendar, which is also called the "yin-yang calendar". Today, almost all Chinese in the world, as well as countries such as the Korean Peninsula and Vietnam, still use the lunar calendar to calculate traditional festivals such as Spring Festival, Mid-Autumn Festival and Dragon Boat Festival.