Calendar: A progressive invention of mankind | Interesting facts about the calendar

Hello everyone, you are on the channel "Thing" and here we will talk about the history of the emergence of ordinary things for us! Do we know much about the things that surround us in everyday life? Most likely, not very much, and therefore we will try to figure out these simple things together.
Man began to observe the change of seasons even before the appearance of ancient states, but at that time there was no date for the beginning and end of the year, time was not divided into seasons and observations of time were limited only to determining the number of days between important events.
The word "calendar" literally translates as "debt book". All because in ancient Rome, debtors paid interest on the days of kalends, the first days of the month. Calendars are a system of calculating long periods of time based on the periodicity of the movement of celestial bodies: the Sun - in solar calendars, the Moon - in lunar calendars and at the same time the Sun and Moon in lunar-solar calendars.
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