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Periodic events and periodic motion have long served as standards for units of time.

Examples include the apparent motion of the sun across the sky, the phases of the moon, the swing of a pendulum, and the beat of a heart.

Lunar calendars were among the first to appear, either 12 or 13 lunar months (either 354 or 384 days).

Without intercalation to add days or months to some years, seasons quickly drift in a calendar based solely on twelve lunar months.

and the clock, a physical mechanism that counts the passage of time.

In day-to-day life, the clock is consulted for periods less than a day whereas the calendar is consulted for periods longer than a day.

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.

Isaac Newton subscribed to this realist view, and hence it is sometimes referred to as Newtonian time.

The importance of the number 12 is due the number of lunar cycles in a year and the number of stars used to count the passage of night.

The most precise timekeeping device of the ancient world was the water clock, or clepsydra, one of which was found in the tomb of Egyptian pharaoh Amenhotep I (1525–1504 BC).

Investigations of a single continuum called spacetime bring questions about space into questions about time, questions that have their roots in the works of early students of natural philosophy.

Temporal measurement has occupied scientists and technologists, and was a prime motivation in navigation and astronomy.

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