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Time is one of the seven fundamental physical quantities in both the International System of Units and International System of Quantities.
Time is used to define other quantities—such as velocity—so defining time in terms of such quantities would result in circularity of definition.
Other early forms of calendars originated in Mesoamerica, particularly in ancient Mayan civilization.
The opposing view is that time does not refer to any kind of "container" that events and objects "move through", nor to any entity that "flows", but that it is instead part of a fundamental intellectual structure (together with space and number) within which humans sequence and compare events.
This second view, in the tradition of Gottfried Leibniz See Units of Time.
Lunisolar calendars have a thirteenth month added to some years to make up for the difference between a full year (now known to be about 365.24 days) and a year of just twelve lunar months.
The numbers twelve and thirteen came to feature prominently in many cultures, at least partly due to this relationship of months to years.
Periodic events and periodic motion have long served as standards for units of time.