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- Daylight Saving Time Why do we use daylight savings time and who invented it?
- 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.
- Making a Sun Clock Before there were clocks, people used shadows to tell time. Learn how to make your own sun clock!
- 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.
- 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.
- 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.
- Local Times Around the World Find out what time it is anywhere in the world.
- NPR : 'Seize the Daylight' Talks about the complicated politics and curious history of daylight standard time.
- When Does Daylight Savings Time Occur Explanation of when and why we have daylight savings 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.
- A History of Time A two-part article that discusses physicist's evolving view of time.
- 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.
- 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.
- Discover Magazine: Time Machine Article explores a clock designed to keep accurate time for 10,000 years.
- A Walk Through Time An illustrated history of timekeeping from ancient times to the present.