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Other early forms of calendars originated in Mesoamerica, particularly in ancient Mayan civilization.These calendars were religiously and astronomically based, with 18 months in a year and 20 days in a month, plus five epagomenal days at the end of the year.

Incense sticks and candles were, and are, commonly used to measure time in temples and churches across the globe.The position of the shadow marks the hour in local time.The idea to separate the day into smaller parts is credited to Egyptians because of their sundials, which operated on a duodecimal system.An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, is highly useful in the conduct of both advanced experiments and everyday affairs of life.The operational definition leaves aside the question whether there is something called time, apart from the counting activity just mentioned, that flows and that can be measured.

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