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Alternative Systems 6
Clocks and Watches 7
Current Time 28
Horology 23
ISO 8601 49
Network Time Protocol 21

Time - Astronomy and Space, Science, School Time, Kids and Teens 23

Sky Calendars - Amateur, Astronomy, Science 13

Calendars and Timekeeping - Astronomy, Science 52

Geochronology - Geology, Earth Sciences, Science 13

Time Travel - Relativity, Physics, Science 16

Timelines - History, Society 55

Time and Timelessness - Physics, Philosophy of Science, Philosophy, Society 12

 A Brief History of TimeA Brief History of Time
Early origins and historical perspectives of time measurement.
 Calendar StudiesCalendar Studies
Information about calendar history and calendar reform.
 Calendar ZoneCalendar Zone
A categorized collection of calendar related sites.
 English CalendarEnglish Calendar
Includes an ecclesiastical calendar and a section on old and new style dating.
 A Few Facts Concerning GMT, UT, and the RGOA Few Facts Concerning GMT, UT, and the RGO
Explains the differences between several time systems.
 A History of TimeA History of Time
Explains the importance of concept of time in the history of mathematics, science and measurement.
 Infoplease: Daylight Saving TimeInfoplease: Daylight Saving Time
Information and history about Daylight Saving Time all over the world.
 International Standard Date and Time NotationInternational Standard Date and Time Notation
An overview of the ISO 8601 notation for dates.
 Internet Encyclopedia of Philosophy: TimeInternet Encyclopedia of Philosophy: Time
Time has been studied for thousands of years. Nevertheless, many issues remain to be resolved. This article explores both what is now known about time and what is controversial and unresolved.
 NIST Time and Frequency DivisionNIST Time and Frequency Division
The National Institute of Standards and Technology maintains time and frequency standards for the United States.
 NPR : 'Seize the Daylight': A History of Clock ChaosNPR : 'Seize the Daylight': A History of Clock Chaos
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]
 This Day In HistoryThis Day In History
Today in history every day - often with pictures and sound.
Provides descriptions of several standards of time.
 Time FAQTime FAQ
Frequently Asked Questions about time (from sci.astro news group)
 Time Zone and Daylight Saving Time DataTime Zone and Daylight Saving Time Data
A directory of sites providing descriptions of civil timekeeping concepts, source code, databases, and maps.
 United States CodeUnited States Code
Weights, measures and standard time.
 U.S. Time ZonesU.S. Time Zones
History of standard time in the U.S.
 A Walk Through TimeA Walk Through Time
Evolution of timekeeping through the centuries.
 Wikipedia: TimeWikipedia: Time
Time is a common term for the experience of duration, and a fundamental quantity of measuring systems. Article explains time definitions, history of measurements, perceptions in religion, philosophy and science.
Article on the time at 0 degrees longitude. Covers the timezone origin, GMT, UTC, GCT, ZULU and JIG.



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