Links include both ancient and modern methods of measuring time.

CONTENTS

Calendars

The 10,000-Year Calendar! With this calendar you can view a month or year calendar for any year from 1 to 10000 A.D. Site provides an explanation on how to use the perpetual calendar, plus Free Calendars, Calendar Converter, Calendar Links, 100-Year Perpetual Calendar, and Download Center where you can download a printable copy of the 10,000-Year Calendar in the format of your choice.

Calendar from time and date.com. Create yearly calendar: Choose a Year and Country - includes Holidays and Observances for selected country. Or Create calendar by month.

Calendar from Wikipedia, the free encyclopedia.

Calendar Months of the Year by Bill Hollon. It's about time—mainly calendars. Includes a running clock with current time and date, An Introduction to Calendars, Identical Calendar Years, Frequently Asked Questions (about calendar years, months and days), and much more. See Site Map.

Calendar a History. Origin of the First Calendar, Who Invented the Calendar, History of the Western Calendar, Gregorian, Julian, and Roman Calendars, Leap Year, How the Days of the Week Got Their Names, When Was the Zero in Use, Sexagesimal Number System, AM, PM, Pleiades (Seven Sisters), Siereal Time, Star Time, BC and AD Inventor Dionysius Exiguss, Month Calendar for Any Year.

The Calendar of Ancient Rome. Learn how the ancient Romans measured time with sundials, waterclocks and sand glasses.

Calendar Zone: Bring Order to Calendrical Chaos! Links to a wide variety of calendars, including shopping and advertising sites: Art, Celestial, Cultural, Daily, Event, Geographic, Historic, Holidays, Interactive, Misc. (includes: All the phases and eclipses of the Moon), Reference, Reform, Religious, Software, Traditional, Web, and Women.

Calendars through the Ages: Calendars from the Sky. Topics covered: Our 7-day week (origin and meaning of names of days of the week), Our year, Calendars (Christian, Jewish, Islamic, Chinese, Mayan, etc.) plus other unusual and interesting subjects relating to time and calendars.

Calendopaedia - THE Encyclopaedia of Calendars. Contents: Comparison of Calendars, Astronomical Calendar, Julian Calendar, Gregorian Calendar, Other Calendars, About Time, and Links to Other Sites. Includes a Complete Index of the Site.

Chambers's Book of Days from University of Wisconsin-Madison Libraries. A Miscellany of Popular Antiquities in connection with the Calendar an electronic reprint of the original: Chambers's Book of Days. Philadelphia: J. B. Lippincott & Co., 1879.

Chinese Calendar from Chinatown Online.co.uk. Equivalent chart: Western year, Chinese year, Chinese Zodiac Sign.

Chinese Calendar from Wikipedia, the free encyclopedia.

The Chinese Calendar. History and information from Calendars through the Ages.

Chinese Calendar - Introduction. Printable Chinese monthly calendar with lunar calendar dates, in PDF. See also The 12 Animals of the Chinese Calendar: Rat Ox Tiger Hare Dragon Snake Horse Sheep Monkey Rooster Dog Boar, Chinese New Year, Chinese Zodiac, Chinese Animal Zodiac with background information and legend about the twelve animals.

The Chinese Calendar. Learn how the ancient Chinese calculated time using the sun, the moon, and oracle bones. Years were also counted from a succession of eras established by reigning emperors.

The Christian Calendar from Calendars through the Ages.

Date Converter. Enter a date in any one of the systems and the converter will convert between the 3 most important date systems (Gregorian Calendar, Julian Calendar, Julian Date) and instantly display the Latin and Roman versions of the Julian Calendar.

Dating - Calender Years. 1752 was the first year in England to officially begin on 1 January. Until the Calendar Act of 1752, the year in England began officially on 25 March (Lady Day), and not 1 January.

Free Printable Calendar Templates. Create free printable calendars that are formatted for Microsoft Word®.

Free Printable Calendars. Free calendars from Printfree.com. Print monthly or yearly calendars. (Pop-up ads).

Frequently Asked Questions about Calendars. Site answers many FAQ about the calendar, e.g. How does one count years? What is the Roman calendar? How did the Romans number days? What does an Islamic year look like? What is the origin of the 7-day week? What is the Long Count in the Mayan Calendar? Did the Mayas think a year was 365 days?

The Indian Calendar from Calendars through the Ages.

The Islamic Calendar from Calendars through the Ages.

The Jewish Calendar from Calendars through the Ages.

The Mathematics of the Chinese Calendar by Helmer Aslaksen, Department of Mathematics, National University of Singapore.

The Mayan Calendar. History and information from Calendars through the Ages. (No longer used).

Moonwise: Date Conversions. Two different conversions for various calendars: Gregorian Calendar, Julian Calendar, Standard Western, Britain and Ireland, Moonwise Calendar (a lunar calendar for people in western countries), Jewish Calendar, Mayan Long Count, Mayan Calendar Round.

Other Ancient Calendars include Babylonian calendar, and the Egyptian calendar.

Printable Calendars. Printable-Calendar.com is a free service that provides unlimited printable calendar templates in two different formats (Word and PDF).

Roman Calendar - Early Roman Calendar. History and information from Calendars through the Ages. (No longer used).

Western-Chinese Calendar Converter. Convert between Solar and Lunar Calendars.

Daylight Saving Time

Daylight saving time from Wikipedia, the free encyclopedia.

Saving Time, Saving Energy. Daylight Saving Time, Its History and Why We Use It by Bob Aldrich, California Energy Commission. Includes a Daylight Saving Time In the United States, 1990 Through 2015. In spring, move clocks forward one hour. In fall, turn clocks backward one hour.

When Does Daylight Time Begin and End? from U.S. Naval Observatory, Astronomical Applications Department. Currently, daylight time begins in the United States on the first Sunday in April and ends on the last Sunday in October. Starting in March 2007, daylight time in the United States will begin on the second Sunday in March and end on the first Sunday in November. Not all places in the U.S. observe daylight time, e.g. Arizona, Hawaii, and most of Indiana do not use it.

History & Science of Time

Geologic Time Table and Geography and Environment Timeline from GEsource.

A Guide to Metric Time or Decimalized Time. Metric Time (MT) is an attempt to create a decimalized time system for our modern base-10 using world.

History of Telling Time - A brief history of time. Talking Clock - Clock shows exact time as of now; click to hear what time it is. (Be patient, slow loading as it figures out where you are in the world). Timeline of Time, Types of Clocks - Sun clocks, Water clocks, Mechanical clocks, Quartz Clocks, Atomic Clocks, Time Zone Information, United States Time Zones, Map of World Time Zones, Telling Time Games & Quizzes, Interactive Teaching Clock, Printable Paper Clock, Telling Time Activities: How old are you in weeks, hours, minutes, seconds? How far away is your next birthday? Time Glossary, plus Lessons and Worksheets for Teachers.

Horologium: Calculating the Hours in Ancient Rome. How the Romans measured time: Hours, Days, Seasons (Winter Solstice and Summer Solstice).

Horology - The Science of Time, Timekeepers (Clocks, Watches) and Timekeeping. (Unfortunately, site has many deadlinks).

How Time Works. Time cannot be seen or sensed. It just happens. Human beings have therefore created ways to measure time that are totally arbitrary. Topics include time's origins, some common time spans, clocks, time zones, daylight-saving time, calendar, B.C. and A.D.

In Greenwich, the Science of Time is Measured in Seconds. Brief reference to a history of time measurement from water drops to atoms. "During the last 1,000 years, cultures kept time by watching sundials, hourglasses, dripping water and even by burning sticks of incense."

Intellectual history of time from Wikipedia, the free encyclopedia.

Measuring time and other spatio-temporal quantities. An article for advanced students. Topics: Effects of Motion, Space-Time Odometer, Light-Clock, Combined Measurements, and Effects of Gravitation.

Telling Time. How humans measure time has changed dramatically through the ages. The Franklin Institute Online offers many links to sites dealing with time.

Time from ThinkQuest Library of Entries - The Sun: Man's Friend and Foe. A brief discussion on time and the sun with reference to the Cheops Pyramid thought to be a huge stone calendar, and the Mayan calendar which predicted eclipses and accurately marked the position of the sun years in advance.

The Time Machine from Manor House Museum. The Time Machine is a 'hands-on' gallery exploring some of the landmarks in timekeeping technology over the last six thousand years. Photos include the Ousden Clock by Cope of Nottingham with the Norman tower dial from around 1869, and a model of Su Sung's water powered escapement, dating back to around 1086.

Timeline. It's About Time: 1500-1300 BC - Sundial first used in Egypt. 400 BC - Greeks use a water clock. 980? - Alfred the Great (a Saxon king) uses burning candles to measure time. 1000? - (Sung dynasty) Candles and burning incense mark time in China. ... to 1998.

A Walk through Time. The Evolution of Time Measurement. Topics covered: Ancient Calendars, Early Clocks, Revolution in Timekeeping, The "Atomic Age", World Time, Scales, National Institute of Standards and Technology (NIST) Time Calibration.

Leap Year

Leap Year. A leap year is a year in which an extra day in added to the calendar in order to synchronize it with the seasons. Find out more about the Leap Year.

Lesson Plans on Time

Eyes on the Sky, Feet on the Ground: Chapter Three - Time and the Calendar from Harvard-Smithsonian Center for Astrophysics. Discussions to follow student activities. Materials listed, how-to-make directions provided.

• Topic 1 - Recording the Passage of Time Activities: How to make Hour Glass or Sand Clock, Water Clock, Candle Clock, Atomic Clock.
• Topic 2 - Time Zones Activities: What Time Is It? Daylight Saving Time.
• Topic 3 - The Moon: A Natural Calendar Activities: Make a Lunar Calendar.
• Topic 4 - The Zodiac Activities: Sun's Yearly Trip Though the Zodiac, Hi! What's Your Sign? Precession of the Earth's Axis.
• Topic 5 - The History of the Calendar Activities: Exploring the Calendar, Make Personalized Calendars.
• Topic 6 - Future Calendars Activity: Invent a New Calendar.

It's About Time - Teacher Sheets. NASA Explores Levels 5-8 Lesson. It's About Time - Student Sheets. Procedures to make a Gnomon and a Sundial. Students to explain: Is the true solar time the same as the time on your clock? How is solar noon determined? Why do we have time zones?

Learning About Time. Lesson for elementary school students, clearly explained and well illustrated. History of Clocks (Using the Sun, Sundial Clocks, Water Clocks, Dividing the Year into Months and Days, Dividing the Day into Hours, Minutes, and Seconds, Pendulum Clocks, Quartz Crystal Clocks, Time Zones), What You See on a Clock, Learning to Tell Time, and Learning to use the Clock Program.

Local Time & Time Zones

Local Times Around the World. First, select a continent or region: Africa, America, Antarctica, Asia, Atlantic, Australia, Europe, or Pacific. Then choose a country and a location to view details.

The MightyCool Atomic Clock. See the current time, reload to see it again.

• PST = Pacific Standard Time (Coordinated Universal Time minus 8 hours, e.g. Los Angeles, Vancouver)
• MST = Mountain Standard Time (UTC-7 hours, e.g. Salt Lake City, Edmonton)
• CST = Central Standard Time (UTC-6 hours, e.g. Chicago, Winnipeg)
• EST = Eastern Standard Time (UTC-5 hours, e.g. New York, Toronto)
• UTC = Coordinated Universal Time, or Greenwich Mean Time, or Zero meridian time, or Zulu time.

The Official U.S. Time. Click on a time zone across a map of the United States, site will instantly provide you with today's date, the current time ticking away, and accurate within 0.3 seconds. Includes links to Time Exhibits.

Time Genie. What Is the Current World Time? Select a location to see the current time, today's date, time zone, Standard Time difference compared to UTC/GMT, Daylight Saving Time if applicable, Latitude, Longitude, 4 digit city code, e.g. cyyz for Toronto, Canada, plus flag of the country.

• Your Clock allows you to compare up to 14 different times around the world.
• Future Time allows you to determine what time it will be in various locations at a time in the future.
• Time Zone Abbreviations.
• World Time gives you the Current Time for 133 Cities Around the World.
• Random Time gives you the Current Time for 150 World Cities, and each time this page is reloaded, 150 cities, towns or villages will appear in a random fashion.

Time Zone Abbreviations from Time and Date.com. Includes Time zone tools and information, Calendars, holidays and date calculators, Calendars and Countdown counters.

• UT = Universal Time
• UTC = Coordinated Universal Time
• GMT = Greenwich Mean Time (used in Europe)
• AST = Atlantic Standard Time (used in U.S. and Canada)
• ET = Eastern Time (used in U.S. and Canada)
• ACDT = Australian Central Daylight Time

Time Zone Converter. Indicates the current time as you access the site. Apart from allowing you to convert time zones in current time, amazingly, this site allows you to specify a given date and time to convert past or future times. Select a location "From Time Zone" and convert "To Time Zone" of another location.

What Time Is It?. See clock display of time right now where you are. USNO Time in Standard Time Zones. USNO Master Clock Animated GIF Clocks: Universal Time GIF Clock (require Netscape).

The World Clock - Time Zones - Current Local Times Around the World. You can sort the list of cities around the globe by City, by Country, or by Time Zones. Includes links to Countdown to New Year, Time Zone abbreviations, Generate a Calendar of any Year of your choice, and more.

World Time - 36 time zones at a glance. See also Countries and Time Zones and Astronomical Background. Available in German and English.

World Time Server.com. Find current time and date anywhere in the world. Search a location by country or by major city.

Get Current Time with World Time Server

Enter a country or city:

Measuring Time - Clocks

Astrolabe. Article describes the history and use of the Astrolabe. See 126 exquisite color photos of Astrolabes from European museums.

Astrolabe from Wikipedia, the free encyclopedia.

The Astrolabe: An Instrument with a Past and a Future. The astrolabe is a very ancient astronomical computer for solving problems relating to time and the position of the sun and stars in the sky. Includes history, typical uses, and collections of Astrolabes.

At Home Astronomy: Making a Simple Astrolabe, Using a Simple Astrolabe

Atomic ticker clocks up 50 years from BBC News. The first atomic clock, which uses the resonance frequencies of atoms to keep extremely precise time, was developed by Dr Louis Essen at UK's National Physical Laboratory in 1953. By 1964, Essen had reduced the timekeeping errors from one second in 300 years to about one second in 2000 years. See also biography of Louis Essen, Louis Essen and Atomic clock from Wikipedia, the free encyclopedia.

A Brief History of Clocks: From Thales to Ptolemy. Includes illustrations of clocks where available. Good diagram of a simple Water Clock. Information geared to more advanced students.

Candle Clock from ChildFun Famil Website - Hanukkah Crafts and Activities. "You will need: 2 tapered candles that are the same length, Ruler, Permanent marker. To make a candle clock, burn one candle for 30 minutes. Measure the difference in length between the 2 candles. This length now represents a half-hour. With the permanent marker, make half-hour marks on both candles. Burn one of the candles for several hours. Have your children tell you how much time has passed by counting the number of marks down the candle has burned."

Chronometry: The Sundial Garden at the Deutsches Museum in München (Munich, Germany). Pictures taken in the Sundial Garden on the day of summer solstice (June 21, 1998) when the sun was at its highest position. Twenty-one sundials are set up in a small area, arranged in historical order. The oldest was invented several thousand years ago, the most recent only in the past few years.

Clock a History. Origin of Clock, Who Invented the First Clock, Water Clocks in Ancient Egypt, Hourglass - Sand Clock, Sundial - Shadow Clock, Water Clocks or Clepsedras, Candle Clock, Weights and Escapement Devices, Spring-Powered Clock, Pendulum Clock, Alarm Clock, Chronometer, Electric Clocks, The Second, The Minute, The Hour, AM and PM, Longitude - Latitude - Prime Meridian, Standard Time Zones, Greenwich Mean Time, The Day.

Clock-Finder.com. Directory of clocks, articles about clocks, including How to Wind a Cuckoo Clock, Lose Weight While You Sleep - Biological clock, and more.

Clock History: An Introduction from Mystical World Wide Web. Contents include: Ancient Calendars, Clocks, Sun Clocks, Water Clocks, Europe & Clocks, Mechanical Clocks, Quartz Clocks, Atomic Clocks, and Time Out.

Clocks by Ellie Crystal. Illustrated. Article covers history of clocks - Sumerians were one of the first ancient people to use sundials by dividing the day into 12 parts and each part about 2 hours long, Egyptians also divided the day into 12 parts and used huge granite columns called Cleopatra Needles (obelisks) to keep track of time periods, Early water clock, Su Sung water clock tower, Hour glass, Modern clocks, Pendulum clocks, Quartz clock, Atomic clocks, Candle was once used as an 'Alarm Clock', and other interesting information.

Clocks ... Teaching Time. Contents: Escape into Time - The Franklin Institute Timepieces Collection (Empress Josephine Clock, Escapements, Fels Clocks, Foucault Pendulum, Frick Electric Program Clock, Seth Thomas Calendar Clock, Sundials, and Synchronome Clock), Tracking Time Projects (Community of Clocks, Millennium Clock Project), The Hands of Time Activities for Students, Measuring Time Lesson Plans for Teachers, plus Elements of Time Vocabulary and Book Lists.

Clockworks: From Sundials to the Atomic Second. Measuring Time from Britannica.com. An amazing site. Provides animated illustrations, history, description, other interesting information, and movie (choice of normal speed or rapid speed movie where applicable) of each time measuring device: Sundial, Clepsydra, Astrolabe, Candle Clock, Sandglass, Weight-Driven Clock, Spring-Driven Clock, Pendulum Clock, Quartz Watch, and a Cesium Atomic Clock. Text version available for those unable to access the graphics version (Shockwave required).

The Development of the Clock and the Concept of Time in the Middle Ages . Examples of some clocks and time keeping instruments typical of the Middle Ages, e.g. Pocket dial, Astrolabe, and Water clock. See also the making of a Canterbury Dial and other Replica Instruments including an automatic water clock.

Exact Time. Click here to see this very instant the exact time on the US Naval Observatory Master Clock. See also exact Universal Time, Eastern Standard Time, Central Standard Time, Mountain Standard Time, Pacific Standard Time, Alaska Standard Time, and Hawaii-Aleutian Standard Time.

Hourglass from Wikipedia, the free encyclopedia.

The Hourglass: How Father Time Got His Hour-Glass. Article briefly covers: clepsydra, sand glass, hourglass, water clock, sand clock, How old is the sand-glass? half-hour glass, burning knotted ropes, candle clock, sundial.

How Atomic Clocks Work from howstuffworks. How is Atomic Time Measured? Are Atomic Clocks Radioactive? What Are the Types of Atomic Clocks? How Does a Practical Cesium Atomic Clock Work? and When Was the Atomic Clock Invented?

How Digital Clocks Work from howstuffworks. Introduction, The Basics, High-Level View, Building Your Own Digital Clock, Circuit Diagram, 7490 Pinout, Creating the Second Hand, Displaying the Time as Numerals.

How Pendulum Clocks Work from howstuffworks. Pendulum clocks have been used to keep time since 1656. Find out how a pendulum clock works, as well as the difference between a weight-driven and a spring-driven clock in the Q & A section.

How Quartz Watches Work from howstuffworks. Introduction, Before Quartz, The Quartz Crystal.

Just on Time from CourierPostOnline, South Jersey's Information Source. "Since ancient times, dating back to 3500 BC, people have measured time in very inventive and creative ways. Time was defined by the rhythms of nature – the rising and setting of the sun, the phases of the moon and the position of stars." Contents: Time units, Sun clocks (sundials), Water clocks, Astrolabe (an astronomical clock for finding the time of a celestial event such as sunrise or sunset and a reference of celestial positions), Candle clocks, Sandglass, Mechanical clocks, Quartz clocks, Standard Time, Atomic clocks.

The Leicester Time Trail by Allan Mills. Illustrated. Contents: Astronomical Background, Sundials, Water Clocks, Modern Sundials, Sandglass and Candle Clock, Mechanical Clocks - Verge-and foliot clocks, Pendulum clocks, Automaton clocks, Public clocks, Domestic clocks, Moon dial, and Astronomical clocks.

Marc Tovar's Wooden ClockWorks. Lots of excellent illustrations of wooden clock plans designed for the scroll saw. Patterns are drawn on TurboCad and are very accurate.

Measuring time by setting fire to various things.

Visualizing Video Streams Using Sand Glass Metaphor by Edward Chang and Yung-Hsiang Lu, Stanford University. Includes illustrations of a 1896 Clog Almanac with the times of the season changes carved on it, Chinese Water Clock, Candle Clock, Coiled Clock, Insense Clock, Sand Clock, Magic Sand Glass, and more.

Water clock from Wikipedia, the free encyclopedia.

Measuring Time - Sundials

Frequently Asked Questions About Sundials from North American Sundial Society. What is a sundial and how do they work? How can I make my own sundial? I have a sundial. How do I set it up? Why doesn't my sundial tell clock time? What types of sundials are there? What is the best way to buy a sundial? and more advanced questions.

History of the Sundial. Sundials can be found in many ancient civilizations, including the Babylonian, Greek, Egyptian, and Roman ages. The oldest record of the sundial can be found in the Bible as it is alluded to in Job 7:2. See pictures of numerous Hand-Crafted Sundials for sale, including Historical & Disc Sundials, Equatorial Sundials, and others. First click to browse category, then click on the links to view more product information and enlarged color photos of many sundials in fine detail.

Portable Sundials from Manor House Museum. Measuring the varying length and position of the shadow is perhaps the earliest concept in time measurement, dating from thousands of years before mechanical devices. Photos include a silver universal ring dial from 1675, and and ivory diptych dial from around 1600.

Sundials on the Internet. Contents include:

• An introduction to sundials and how they work
• Six sundial projects for you to make
• How to set up a horizontal sundial
• Pictures and descriptions of new public sundials from all over the world
• The many different types of sundials
• The Leicester Time Trail by Allan Mills with illustrations: Astronomical Background, Sundials, Water Clocks, Modern Sundials.

  Solar Noon Calendar. Print Your Solar Noon Calendar wherever you are in the world. Site provides you with a table showing the exact time of solar noon for your exact location for each day of the year, enabling you to set up your sundial with accuracy.

  Sundial from Wikipedia, the free encyclopedia.

  Sundials - NASA KIDS. Step-by-step guide on how to make a sundial.

  Sundials, How Sundials Work, Building a Simple Sundial, from NASA.

  Sunshine in Your Pocket! Making a sundial for the Northern hemisphere. Choose a level on how to make your own horizontal sundial: Advanced, Intermediate, or Novice. If you are not comfortable using a protractor and are not familiar with the trig functions sine and tangent, you can start at the Novice level. Excellent Website.

  Miscellaneous Sites on Time

  How time works from howstuffworks. Contents: Introduction to How Time Works, Time's Origins, Clocks, Time Zones, Daylight-saving Time, The Calendar: Years, Months, B.C. and A.D., plus related articles:

• How Pendulum Clocks Work
• How Digital Clocks Work
• How Quartz Watches Work
• How Atomic Clocks Work
• How Time Travel Will Work, plus links to:
• Time and Date.com
• World Time Server
• The World Clock - Time Zones
• U.S. Naval Observatory: World Time Zones.

  Institute for National Measurement Standards (INMS) from National Research Council Canada. NRC Time Services include: Web Clock, Daily Time Broadcasts, Telephone Talking Clock, Computer Time & Date, Short Wave Station, Broadcasts/CHU Codes, Network Time Protocol (NTP), Global Positioning Data (GPS), plus Time Zones & Daylight Savings Time.

  Mr. Dowling's Electronic Passport: Time and Space. Daylight Saving Time, Measuring Time, Years, plus A Look at the Stars, Aristotle's Conclusion, Copernicus, Galileo's Observations, Isaac Newton and Gravity, Longitude and Latitude, Seasons, Map Projections, and more.

  Once Upon A Time Slideshows. Journey through Time and discover how telling time evolved from ancient civilizations to the present. Topics covered: Calendar, Seasons, Measuring Time (Day, Hours, Months, Seconds, Years, Daylight Saving Time, and Timepieces). Includes Interactive Classroom Activities.

  Telling Time Without a Clock: Scandinavian Daymarks. Pointing at the Sun, Hours of Day, Hours of Night, Scandinavian Daymarks, Midday Daymark, Other Daymarks, Daymarks and Day Sections Among Other Peoples, How Daymarks Work, Class Projects: Schoolyard Daymarks and Classroom Noon-Line Project.

  Time from Geography World. Links include: Aztec Calendar, Geologic Time, Local Times Around the World, Make Your Own Star Clock, Making a Horizontal Sundial, Making a Sun Clock, Time Zone Converter, World Time Clock, Year at-a-glance Calendar, Time - Games, Puzzles, and Quizzes, and Word Find Puzzle: Calendar.

  Time and the History of its Measurement. Scottish school experiments. Diagrams explain how the Egyptian T-stick worked, simple ways to make sundials, how a sinking bowl was used to measure time, as well as how to make water clocks using a large plastic container, a yogurt pot, and a plastic container with no lid with a hole in the base.

  Time Clocks. TimeClocks Directory - everything about timekeeping: time clocks, time cards, time sheets. Mostly commercial sites.

  Timekeeping Fact Files from National Maritime Museum, Royal Observatory Greenwich. Contents include: What Is Time? Sundials: History of the sundial, Sundial theory, Types of sundial, Sundials in Cambridge, Time: History of Time, Atomic time, Universal Time, Civil time, Local time, Sidereal time, Solar time, What is the time right now? The Calendar: The day, The week, The month, The year, Other calendars, Calendar reform, The Equation of Time, Equinoxes and solstices - updated, Leap Years, Summer Time, and more.

  Today's Calendar and Clock Page. Links to numerous date, time, calendar sites: General sites, Jewish, Moslem, Bahá'í, Chinese ("Lunar") Calendar, Persian and Parsi, Buddhist, Hindu and Other Indian Calendars, Historical Calendars, Countdown scripts, African Calendars, Celestial, World Holidays Calendars, "This Day" Sites, Maya / Aztec Calendars, Name Days, Special Clocks, Reference Material, and Change the Calendar!

  What's the Time? from Riverdeep Interactive Learning Limited. Units of Timekeeping, Pendulum Clocks, Quartz Crystal Clocks, Atomic Clocks, February 29 - Not Just Another Day - Article about Egyptian Calendar, Julian Calendar, Gregorian Calendar, as well as Hebrew, Islamic, and Chinese Calendars.

  www.timeanddate.com. A wide range of topics are covered: Time (World Clock, Search for City, Meeting Planner), Date (Calendar), Counters (countdown to any future date of your choice), Starting dates for Centuries and for Millennia, plus Latest updates.

  
  

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