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Sunday is named after the sun and Monday is named after the moon. [©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

Where do the names of the days of the week come from?

Find out where the names of the days of the week come from.

The calendar year is 365 days, five hours, 48 minutes, 46 seconds. [©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

What is the exact length of the calendar year?

Find out the exact length of the calendar year.

Universal Time replaced Greenwich Mean Time in 1972. [©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

What is meant by universal time?

Learn what is meant by universal time and when it was instituted.

The correct time in the U.S. is established using an atomic clock. [©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

Who establishes the correct time in the United States?

Learn who establishes the correct time in the United States.

Julius Caesar made January 1 the first day of the new year in 45 B.C.E. [©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

When did January 1 become the first day of the new year?

Find out when January 1 had become the first day of the new year.

A new century began January 1, 2001. [©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

When does a century begin?

Learn when a century begins and how many years are in a century.

The largest floral clock is located in Japan. [©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

What is a floral clock?

Read about what a floral clock is and when it was first used.

The alarm clock was invented in 1787. [©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

Who invented the alarm clock?

Find out who invented the alarm clock and how it's been improved.

Military time divides the day into one set of 24 hours.[©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

What is military time?

Read about what military time is and how it's organized.

Water can be weighed in a multitude of measurements, including quarts and liters. [©Jupiter Images, 2010]

Science and Engineering » Weights and Measures

How much does water weigh?

Learn how much water weighs using U.S. and British measurements.

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