Directory of Time Resources

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Resources in This Category

• A History of Time

  http://www-history.mcs.st-andrews.ac.uk/HistTopics/Time_1.html
  A two-part article that discusses physicist's evolving view of time.

• A Walk Through Time

  http://www.nist.gov/pml/general/time/index.cfm
  An illustrated history of timekeeping from ancient times to the present.

• Daylight Saving Time

  http://www.mrdowling.com/601-daylight.html
  Why do we use daylight savings time and who invented it?

• Discover Magazine: Time Machine

  http://discovermagazine.com/2005/nov/cover
  Article explores a clock designed to keep accurate time for 10,000 years.

• International Standard Date and Time Notation

  http://www.cl.cam.ac.uk/~mgk25/iso-time.html
  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

  http://www-spof.gsfc.nasa.gov/stargaze/Slatlong.htm
  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

  http://www.timeanddate.com/worldclock/
  Find out what time it is anywhere in the world.

• Making a Horizontal Sundial

  http://www.lmsal.com/YPOP/Classroom/Lessons/Sundials/sundials.html
  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

  http://www.exploratorium.edu/science_explorer/sunclock.html
  Before there were clocks, people used shadows to tell time. Learn how to make your own sun clock!

• NPR : 'Seize the Daylight'

  http://www.npr.org/templates/story/story.php?storyId=4572036
  Talks about the complicated politics and curious history of daylight standard time.

• On Time

  http://americanhistory.si.edu/ontime/
  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.

• The Galileo Project - Pendulum Clock

  http://galileo.rice.edu/sci/instruments/pendulum.html
  Describes Galileo's work on pendulums and the pendulum clock.

• The Hourglass

  http://www.uh.edu/engines/epi1469.htm
  The University of Houston College of engineering, describes how an hourglass works and also provides interesting facts about this timekeeper.

• Time

  http://www.mrdowling.com/601-time.html
  Just how do we measure time and what has Greenwich England got to do with it?

• Time Travel

  http://www.pbs.org/wgbh/nova/time/
  Is time travel possible? See what Carl Sagan and Einstein had to say about time travel in this NOVA special.

• US Library of Congress - How does an hourglass measure time?

  http://www.loc.gov/rr/scitech/mysteries/hourglass.html
  Answers questions about how an hourglass keeps time and what are the contributing factors determining how long an hourglass lasts.

• What Time Is It!

  http://www.whattimeisit.com/
  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.

• When Does Daylight Savings Time Occur

  http://www.logan.ws/articles/when_does_daylight_savings_time_occur.asp
  Explanation of when and why we have daylight savings time.

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