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Moment (unit)

physical science Maturity 11-13 Next article →

A moment is a special unit of time from the Middle Ages.

CLM 14456 71r detail
CLM 14456 71r detail

It is not like the minutes we use today. Long ago, people did not have mechanical clocks to help them. Instead, they looked at the sun to see the time. They watched how shadows moved on a sundial. This helped them understand how much time had passed. A moment was a way to measure these small parts of a day.

To understand a moment, you must first look at a solar hour. A solar hour is the time between sunrise and sunset.

CLM 14456 71r detail
CLM 14456 71r detail

The length of this hour changed with the seasons. In summer, the days were long. In winter, the days were short. Because the hours changed, the moments changed too. On average, one moment was about 90 seconds long. One solar hour could be split into 4, 10, or 40 moments.

We know about this system from very old writings.

CLM 14456 71r detail
CLM 14456 71r detail

The Venerable Bede wrote about moments in the 8th century. He described how one solar hour could be split into different amounts. Five centuries later, other writers used his work. Bartholomeus Anglicus wrote about it in his encyclopedia. Roger Bacon also wrote about these time measurements. These thinkers helped keep the idea of the moment alive.

There were many different ways to divide time back then.

CLM 14456 71r detail
CLM 14456 71r detail

Some people divided a solar day into 24 hours. These hours could be equal or unequal in length. Later, people even tried to make moments much smaller. They divided a moment into 12 ounces. Each ounce was made of 47 atoms. These atoms were tiny parts of a moment. No one could actually see these small parts with their tools.

Most common people did not use moments in their daily lives.

CLM 14456 71r detail
CLM 14456 71r detail

They used the sun to track the passing day. They also listened for calls to prayer to know the time. Everything changed in the late 13th century. Mechanical clocks were introduced during this time. People also started using a new math system based on 60. This new way of measuring time replaced the medieval moment.

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