What does the word "calendar" mean?

In Oracle Bone Inscriptions's "calendar", the upper part is two wo characters, indicating rows of crops, and the lower part is a foot with toes up and heels down, indicating that the foot has walked through rows of crops. The word "factory" was added to the top of the word "calendar" in the inscription on the bronze inscription, indicating that crops were planted in front of the cliff. Since then, Xiao Zhuan, Li Shu and regular script have all followed this writing method. No matter what form the word "calendar" is, the whole glyph means people crossing between crops, so its original meaning is crossing, crossing. Extend to experience, leap, cost, etc. , also refers to all or all the time in the past, such as calendar years, dynasties, etc.

"Calendar" also refers to the calendar, which is a method to calculate the season and climate as well as the year, month and day. Generally divided into lunar calendar, solar calendar and yin-yang calendar. The calendar based on the cycle of the moon is a lunar calendar, and the calendar based on the movement of the sun is a solar calendar. The lunar calendar considers the changes of the sun and the moon at the same time. Books and tables that record the year, month, day and solar terms are also called "calendars", such as calendars, calendars and calendars. Almanac is also written as almanac. It is said that Tang Wenzong and Li Ang once ordered that the almanac must be "king-ordered" by the emperor himself, and only the official seal was allowed. Since then, the almanac has become an "imperial calendar". In the ninth year of Daiwa, Tang Wenzong (835) printed a Xuan Ming calendar, which contained the month, day, hour and solar terms. The oldest existing printed almanac was printed in Tang Xizong Ganfu four years (877). Under normal circumstances, in addition to recording solar terms in farming season, the yellow calendar will also record superstitious taboos, explaining what can and cannot be done on a certain day.