Time Astronomy and Space Science

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Top: Kids_and_Teens: School_Time: Science: Astronomy_and_Space: Time:

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• - An illustrated history of timekeeping from ancient times to the present.
  
• - 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"
  
• - 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.
  
• - Provides online times converter and brief information about GMT/UTC.
  
• - International Standard ISO 8601 specifies numeric representations of date and time. It helps to avoid confusion caused by the many different national notations.
  
• - Just how do we measure time and what has Greenwich England got to do with it?
  
• - Calculate the exact time in days, hours, minutes and seconds from now until your birthday or any other event.
  
• - Introduction to latitude and longitude, a way of calculating exactly where you are anyplace on earth and a way to tell time.
  
• - Before there were clocks, people used shadows to tell time. Learn how to make your own sun clock!
  
• - Learn how to make a sundial. Instructions are for beginners, intermediate, or advanced, and work for either the northern or southern hemispheres.
  
• - Is time travel possible? See what Carl Sagan and Einstein had to say about time travel in this NOVA special.
  
• - Learn how to tell time by finding constellations in the night sky.
  
• - Find out what time it is anywhere in the world.
  
• - Why do we use daylight savings time and who invented it?