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Moment (unit)

physical science Maturity 11-13 Next article →

Long ago, people used a unit of time called a moment.

CLM 14456 71r detail
CLM 14456 71r detail

It was not like our clocks today. People used the sun to tell time. They watched shadows move on a sundial.

A moment was a small part of a solar hour. A solar hour is the time between sunrise and sunset. The length of an hour changed with the seasons. This meant a moment was not always the same length. On average, a moment was about 90 seconds long.

One hour could be split into many parts. Some people split an hour into 4, 10, or 40 moments. The Venerable Bede wrote about this in the 8th century. Later, people even split a moment into smaller parts. They called these tiny parts atoms. They could split a moment into 12 ounces. Each ounce had 47 atoms. People could not use tools to see such small bits.

Common people did not use moments in daily life. They used the sun to track time. They also used calls to prayer to know the time. Mechanical clocks and new math changed how we measure time in the late 13th century.

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