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[ Teens/Mature Teens ] - An illustrated history of timekeeping from ancient times to the present.
Google PR
Countdown
[ Kids/Teens/Mature Teens ] - Calculate the exact time in days, hours, minutes and seconds from now until your birthday or any other event.
Google PR
Daylight Saving Time
[ Teens/Mature Teens ] - Why do we use daylight savings time and who invented it?
Google PR
International Standard Date and Time Notation
[ Mature Teens ] - International Standard ISO 8601 specifies numeric representations of date and time. It helps to avoid confusion caused by the many different national notations.
Google PR
Latitude and Longitude
[ Mature Teens ] - Introduction to latitude and longitude, a way of calculating exactly where you are anyplace on earth and a way to tell time.
Google PR
Local Times Around the World
[ Teens/Mature Teens ] - Find out what time it is anywhere in the world.
Google PR
Make Your Own Star Clock
[ Kids/Teens/Mature Teens ] - Learn how to tell time by finding constellations in the night sky.
Google PR
Making a Horizontal Sundial
[ Teens/Mature Teens ] - Learn how to make a sundial. Instructions are for beginners, intermediate, or advanced, and work for either the northern or southern hemispheres.
Google PR
Making a Sun Clock
[ Kids/Teens ] - Before there were clocks, people used shadows to tell time. Learn how to make your own sun clock!
Google PR
NPR : 'Seize the Daylight': A History of Clock Chaos
[ Teens/Mature Teens ] - 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' Author David Prerau talks about the complicated politics and curious history of DST, and he shares an excerpt from his book. [4:54 streaming audio broadcast]
