Math for Students
Kids and Teens
Astronomy and Space
Kids and Teens: Top/Kids and Teens/School Time/Reference Tools/Calendars
A Walk Through Time
: An illustrated history of timekeeping from ancient times to the present.
: 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
: 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
: 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!
: Just how do we measure time and what has Greenwich England got to do with it?
: Is time travel possible? See what Carl Sagan and Einstein had to say about time travel in this NOVA special.
What Time is it!
: 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.
World Time Converter
: Provides online times converter and brief information about GMT/UTC.
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