Ancient yearbook

A perpetual calendar refers to a watch that does not need manpower to allocate dates and months for 10 thousand years.

The calendar design of general mechanical watches takes 3 1 day as a cycle.

Therefore, in every abortion with only 30 days, the date number must be manually moved forward by one day.

The perpetual calendar will automatically jump to 1 of next month according to whether the end of the month is 3 1 of the big month or 30/of the small month.

A calendar with February 29th can be automatically adjusted every four years in a leap year, which is called a "big calendar", while a calendar that cannot be displayed as February 29th in a leap year and needs to be adjusted every four years is called a "small calendar".

Extended data:

From the beginning of the Five Emperors (about the beginning of the 26th century BC) to the end of Qing Dynasty 19 1 1 year.

Taking the ancient calendar of China as the main line, taking the Yin and Yang calendar (Lunar Calendar) prevailing in ancient China as the main framework, and matching it with the corresponding solar calendar and trunk calendar.

In the turbulent period when several regimes coexist, each has its own calendar, and the different months and days are listed in another table.

During the Spring and Autumn Period and the Warring States Period, the chronologies of governors, sixteen countries and ten countries were put on the chronology respectively.

Nanming and Taiping Heavenly Kingdom were attached to Ming and Qing Dynasties as sub-tables.

Readers can quickly and accurately find the main branches of the Gregorian calendar and the history of China every month and every day.

A watch refers to a tool worn on your wrist to time/display time. In English, watch comes from the word wacche in the middle ages.

Watches are usually made of leather, rubber, nylon cloth, stainless steel and other materials, and the "meter" showing time is tied on the wrist.