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DMOZ » Kids and Teens » School Time » Science » Astronomy and Space » Time
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Open Directory - Kids and Teens: School Time: Science: Astronomy and Space: Time
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  • A History of Time
    [ ] - A two-part article that discusses physicist's evolving view of time.
  • A Walk Through Time
    [ ] - An illustrated history of timekeeping from ancient times to the present.
  • Countdown
    [ ] - Calculate the exact time in days, hours, minutes and seconds from now until your birthday or any other event.
  • Daylight Saving Time
    [ ] - Why do we use daylight savings time and who invented it?
  • Discover Magazine: Time Machine
    [ ] - Article explores a clock designed to keep accurate time for 10,000 years.
  • How Stuff Works: Time
    [ ] - Complete five-part explanation of time and how it is measured, including information about clocks, time zones, and calendars.
  • International Standard Date and Time Notation
    [ ] - International Standard ISO 8601 specifies numeric representations of date and time. It helps to avoid confusion caused by the many different national notations.
  • Latitude and Longitude
    [ ] - Introduction to latitude and longitude, a way of calculating exactly where you are anyplace on earth and a way to tell time.
  • Local Times Around the World
    [ ] - Find out what time it is anywhere in the world.
  • Making a Horizontal Sundial
    [ ] - Learn how to make a sundial. Instructions are for beginners, intermediate, or advanced, and work for either the northern or southern hemispheres.
  • Making a Sun Clock
    [ ] - Before there were clocks, people used shadows to tell time. Learn how to make your own sun clock!
  • NPR : 'Seize the Daylight'
    [ ] - Talks about the complicated politics and curious history of daylight standard time.
  • On Time
    [ ] - Learn about the history of time measuring devices in this online Smithsonian Institute exhibit. Page discusses how the accuracy of watches and clocks affected people's perception and usage of time.
  • Science Museum - Atomic Clocks
    [ ] - Talks about how different types of atomic clocks work, and the history of their invention.
  • The Galileo Project - Pendulum Clock
    [ ] - Describes Galileo's work on pendulums and the pendulum clock.
  • The Hourglass
    [ ] - The University of Houston College of engineering, describes how an hourglass works and also provides interesting facts about this timekeeper.
  • Time
    [ ] - Just how do we measure time and what has Greenwich England got to do with it?
  • Time Travel
    [ ] - Is time travel possible? See what Carl Sagan and Einstein had to say about time travel in this NOVA special.
  • US Library of Congress - How does an hourglass measure time?
    [ ] - Answers questions about how an hourglass keeps time and what are the contributing factors determining how long an hourglass lasts.
  • What Time Is It!
    [ ] - Gives the current time, synchronized by NIST. Close to 100 different time zones supported, as well as the ability to select the default time zone.
  • When Does Daylight Savings Time Occur
    [ ] - Explanation of when and why we have daylight savings time.
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