What is the significance of the existence of almanac?

The almanac is a kind of almanac that can display various calendars such as Gregorian calendar, Lunar calendar and Ganzhi calendar at the same time, and has a large number of rules and contents related to seeking good fortune and avoiding evil. The main contents of the Gregorian calendar are the schedule of the twenty-four solar terms, the good and bad luck of each day, the luck of the zodiac and so on. That is, the ancient Han people recorded their daily likes and dislikes on the calendar as a guide to action.

Nowadays, many people also read almanac as a reference for action.

China perpetual calendar