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    Kids and Teens > School Time > Reference Tools > Calendars  (29)

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	Local Times Around the World - http://www.timeanddate.com/worldclock/ Find out what time it is anywhere in the world.
	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.
	A Walk Through Time - http://physics.nist.gov/GenInt/Time/time.html An illustrated history of timekeeping from ancient times to the present.
	http://americanhistory.si.edu/ontime/ - 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.
	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.
	Industrious Clock - http://yugop.com/ver3/stuff/03/fla.html Clock using video of a hand drawing to display the time.
	The Galileo Project - Pendulum Clock - http://galileo.rice.edu/sci/instruments/pendulum.html Describes Galileo's work on pendulums and the pendulum clock.
	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!
	Science Museum - Atomic Clocks - http://www.sciencemuseum.org.uk/onlinestuff/stories/atomic_clocks.aspx Talks about how different types of atomic clocks work, and the history of their invention.

	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.
	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.
	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.
	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.
	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.

	Discover Magazine: Time Machine - http://discovermagazine.com/2005/nov/cover Article explores a clock designed to keep accurate time for 10,000 years.
	http://www.mrdowling.com/601-time.html - http://www.mrdowling.com/601-time.html Just how do we measure time and what has Greenwich England got to do with it?
	Daylight Saving Time - http://www.mrdowling.com/601-daylight.html Why do we use daylight savings time and who invented it?
	Countdown - http://www.spiders.com/portfolio/demos/countdown/ Calculate the exact time in days, hours, minutes and seconds from now until your birthday or any other event.
	How Stuff Works: Time - http://www.howstuffworks.com/time.htm Complete five-part explanation of time and how it is measured, including information about clocks, time zones, and calendars.

	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.
	World Time Converter - http://www.gkindia.com/bitsol_time/ Provides online times converter and brief information about GMT/UTC.
	National Geographic Kids Magazine: Water Clock Experiment - http://www.nationalgeographic.com/ngkids/trythis/try10.html Demonstrates how water clocks can be used to keep time.
	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.

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