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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.

Increasingly, personal electronic devices display both calendars and clocks simultaneously.

The number (as on a clock dial or calendar) that marks the occurrence of a specified event as to hour or date is obtained by counting from a fiducial epoch—a central reference point.

Time is one of the seven fundamental physical quantities in both the International System of Units and International System of Quantities.

This second view, in the tradition of Gottfried Leibniz See Units of Time.

The reforms of Julius Caesar in 45 BC put the Roman world on a solar calendar.

This Julian calendar was faulty in that its intercalation still allowed the astronomical solstices and equinoxes to advance against it by about 11 minutes per year.

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.

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