- 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.
- Make Your Own Star Clock - Learn how to tell time by finding constellations in the night sky.
- 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.
- A Walk Through Time - An illustrated history of timekeeping from ancient times to the present.
- 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.
- World Time Converter - Provides online times converter and brief information about GMT/UTC.
- Local Times Around the World - Find out what time it is anywhere in the world.
- NPR : 'Seize the Daylight': A History of Clock Chaos - Benjamin Franklin first called for the government to tinker with clock hours in the 1780s. But it wasn't until World War I that the United States adopted daylight-saving time as a way to get more efficiency out of the day. "Seize the Daylight" Author Da
- Countdown - Calculate the exact time in days, hours, minutes and seconds from now until your birthday or any other event.
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