Today's program is about a centuries-old mystery. Sarah Long and Bob Doughty discuss the enigma of time.

You can tell what time it is if you can read a clock. However, no one knows what time is. We are unable to see it. We are unable to touch it. We are unable to hear it. We just know it by the way we commemorate its death.

Despite our progress in calculating the tiniest fractions of time, time remains one of the universe's great mysteries.

Imagine a world without time as one way of thinking about time. There should be no movement because time and motion are inextricably linked.

Only if there were no changes could a world without time occur. Since time and change are inextricably related. When anything changes, we know time has passed.

Change is constant in the real world — the world of time. Some modifications, such as a lunar eclipse, occur only once in a while. Others, such as the rising and lowering of the sun, occur on a daily basis. Natural phenomena that replicate themselves have long been recognized by humans. People started to quantify time as they began to count those occurrences.

The only variations that appeared to repeat themselves evenly in early human history were the motions of objects in the sky. The disparity between light and darkness was the most obvious product of these movements.

The sun rises in the eastern sky, allowing light to be emitted. It travels through the sky, sinking in the west and bringing darkness with it. The sun's emergence and absence were consistent and predictable. It provided the first recognized periods of time by creating periods of light and darkness. Every cycle of light and darkness has been given a name: one day.

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