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| NIST Time and Frequency Division - http://www.boulder.nist.gov/timefreq/ The National Institute of Standards and Technology maintains time and frequency standards for the United States.
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| A Walk Through Time - http://physics.nist.gov/GenInt/Time/time.html Evolution of timekeeping through the centuries.
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| Calendar Zone - http://www.calendarzone.com/ A categorized collection of calendar related sites.
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| United States Code - http://tycho.usno.navy.mil/260.html Weights, measures and standard time.
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| English Calendar - http://www.albion.edu/english/calendar/ Includes an ecclesiastical calendar and a section on old and new style dating.
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| This Day In History - http://www.HistoryChannel.com/today/ Today in history every day - often with pictures and sound.
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| Calendar Studies - http://www.hermetic.ch/cal_stud.htm Information about calendar history and calendar reform.
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| Atomic Clock Time - http://www.atomictime.net/ Displayed in a variety of useful formats. Site is a front-end to U.S. government atomic clocks.
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| Time - http://scienceworld.wolfram.com/astronomy/Time.html Provides descriptions of several standards of time.
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| Time FAQ - http://www.faqs.org/faqs/astronomy/faq/part3/ Frequently Asked Questions about time (from sci.astro news group)
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| Date Algorithms - http://vsg.cape.com/~pbaum/date/date0.htm Provides descriptions, proofs and computer programming implementation examples to convert dates to various calendar dates for Julian, Gregorian, and Rata Die calendars.
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| The Calendar - http://www.skeptics.com.au/journal/calendar.htm Summarizes the history of various calendars developed and used over the centuries.
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| Time References - http://htexplained.com/watches/TimeRef/ To set your watch or clock accurately using a time reference. Explains the various options for residents of North America.
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| Light of Day - http://www.lightofday.primetap.com Shedding light on Queensland's daylight saving opposition.
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