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| | Calendars - Reference Tools, School Time, Kids and Teens 28
 CountdownCountdown
 [ Kids/Teens/Mature Teens ]Calculate the exact time in days, hours, minutes and seconds from now until your birthday or any other event.
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Daylight Saving TimeDaylight Saving Time
 [ Teens/Mature Teens ]Why do we use daylight savings time and who invented it?
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Discover Magazine: Time MachineDiscover Magazine: Time Machine
 [ Teens/Mature Teens ]Article explores a clock designed to keep accurate time for 10,000 years.
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The Galileo Project - Pendulum ClockThe Galileo Project - Pendulum Clock
 [ Teens/Mature Teens ]Describes Galileo's work on pendulums and the pendulum clock.
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A History of TimeA History of Time
 [ Teens/Mature Teens ]A two-part article that discusses physicist's evolving view of time.
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The HourglassThe Hourglass
 [ Kids/Teens ]The University of Houston College of engineering, describes how an hourglass works and also provides interesting facts about this timekeeper.
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How Stuff Works: TimeHow Stuff Works: Time
 [ Teens/Mature Teens ]Complete five-part explanation of time and how it is measured, including information about clocks, time zones, and calendars.
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Industrious ClockIndustrious Clock
 [ Kids/Teens/Mature Teens ]Clock using video of a hand drawing to display the time.
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International Standard Date and Time NotationInternational Standard Date and Time Notation
 [ Mature Teens ]International Standard ISO 8601 specifies numeric representations of date and time. It helps to avoid confusion caused by the many different national notations.
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Latitude and LongitudeLatitude and Longitude
 [ Mature Teens ]Introduction to latitude and longitude, a way of calculating exactly where you are anyplace on earth and a way to tell time.
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Local Times Around the WorldLocal Times Around the World
 [ Teens/Mature Teens ]Find out what time it is anywhere in the world.
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Make Your Own Star ClockMake Your Own Star Clock
 [ Kids/Teens/Mature Teens ]Learn how to tell time by finding constellations in the night sky.
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Making a Horizontal SundialMaking a Horizontal Sundial
 [ Teens/Mature Teens ]Learn how to make a sundial. Instructions are for beginners, intermediate, or advanced, and work for either the northern or southern hemispheres.
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Making a Sun ClockMaking a Sun Clock
 [ Kids/Teens ]Before there were clocks, people used shadows to tell time. Learn how to make your own sun clock!
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National Geographic Kids Magazine: Water Clock ExperimentNational Geographic Kids Magazine: Water Clock Experiment
 [ Kids/Teens ]Demonstrates how water clocks can be used to keep time.
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NPR : 'Seize the Daylight'NPR : 'Seize the Daylight'
 [ Teens/Mature Teens ]Talks about the complicated politics and curious history of daylight standard time.
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On TimeOn Time
 [ Kids/Teens/Mature Teens ]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.
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Science Museum - Atomic ClocksScience Museum - Atomic Clocks
 [ Teens/Mature Teens ]Talks about how different types of atomic clocks work, and the history of their invention.
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TimeTime
 [ Kids/Teens ]Just how do we measure time and what has Greenwich England got to do with it?
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Time TravelTime Travel
 [ Teens/Mature Teens ]Is time travel possible? See what Carl Sagan and Einstein had to say about time travel in this NOVA special.
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US Library of Congress - How does an hourglass measure time?US Library of Congress - How does an hourglass measure time?
 [ Kids/Teens/Mature Teens ]Answers questions about how an hourglass keeps time and what are the contributing factors determining how long an hourglass lasts.
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A Walk Through TimeA Walk Through Time
 [ Teens/Mature Teens ]An illustrated history of timekeeping from ancient times to the present.
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What Time Is It!What Time Is It!
 [ Kids/Teens/Mature Teens ]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.
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When Does Daylight Savings Time OccurWhen Does Daylight Savings Time Occur
 [ Teens/Mature Teens ]Explanation of when and why we have daylight savings time.
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World Time ConverterWorld Time Converter
 [ Teens/Mature Teens ]Provides online times converter and brief information about GMT/UTC.
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