Ever since the Earth began its motion, it has served as a measure of the passage of time. The day is measured by the planet's rotation, and the year by its revolution. Currently, years are calculated from the birth of Christ—2,026 years have passed since then. The age of the universe is calculated from the Big Bang: 13.8 billion years. Days are measured in hours, spanning from one midnight to the next. A person's age begins at birth. Clocks measure time based on midnight and noon. As the examples above show, the measurement of time always involves the past. Although the past no longer exists, the sequential measurement of time remains. Time is a sequential mathematical entity. The fact that the past does not exist leads some to believe that time itself does not exist.
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