Solar calendar. There were 365 days in a year. The calendar was created by observing the stars. The year was divided not into 4 seasons, but into 3, each with 4 months. The seasons were called: flood, shoots and drought. The year began with the rise of the river, surprisingly it happened on the same day, year after year, for millennia.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.