The creation of the first calendars was also associated with the emergence of the first states. At first, the count was carried out by lunar months, since the changes in the lunar disk were easy to see and correlate with certain periods of time. The first solar calendar was invented in Ancient Egypt, and the most accurate calendar was created by the ancient Maya people in Central America.
All peoples considered time differently. Scientists had to work hard to be able to date the events of ancient history according to the calendar we are used to.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.