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Time
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A Walk Through Time - An illustrated history of timekeeping from ancient times to the present, by NIST
 
Clocks - Kids Almanac explains mechanical and electric clocks, and discusses some famous clocks like London's Big Ben.
 
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?
 
International Standard Date and Time Notation - An overview of the ISO 8601 notation for dates.
 
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.
 
Make Your Own Star Clock - Learn how to tell time by finding constellations in the night sky.
 
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!
 
Time - Learn about time and how it is measured, a little about the psychology of time, time and relativity, and a little about biorhythms.
 
Time - Learn about time and how it is measured, a little about the psychology of time, time and relativity, and a little about biorhythms.
 
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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