The calendar

I noticed that people are hostages of their own invented phenomena or events. Phenomena that do not exist in the real world, but only in the human brain. Nu An example of a calendar. We all use this way to navigate in the days and seasons. But for some, the people of calendars are not the product, but the basis of life. For example, many events are attached to the so-called lunar calendar. neuzhelt in this world, something can depend on the course of events. For example, at what speed does the moon rotate?