| Countdown - 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 Time - Why do we use daylight savings time and who invented it?
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| International Standard Date and Time Notation - by Markus Kuhn - An introduction to ISO 8601, the YYYY-MM-DD date and the 24-hour time notation, with notes on week numbers and on implementation.
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| 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.
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| Make Your Own Star Clock - Learn how to tell time by finding constellations in the night sky.
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| Making a Sun Clock - Before there were clocks, people used shadows to tell time. Learn how to make your own sun clock!
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| 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.
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| Time - Just how do we measure time and what has Greenwich England got to do with it?
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| Time Travel - Is time travel possible? See what Carl Sagan and Einstein had to say about time travel in this NOVA special.
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| A Walk Through Time - An illustrated history of timekeeping from ancient times to the present
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| 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.
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| World Time Converter - Provides online times converter and brief information about GMT/UTC.
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| Local Times Around the World - Find out what time it is anywhere in the world.
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