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What is Time? popular

http://en.wikipedia.org/wiki/Time

9 out of 10 stars (236 votes)

Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects. The temporal position of events with respect to the transitory present is continually changing; future events become present, then pass further and further into the past. Time has been a major subject of religion, philosophy, and science, but defining it in a non-controversial manner applicable to all fields of study has consistently eluded the greatest scholars. A simple definition states that "time is what clocks measure". Time is one of the seven fundamental physical quantities in the International System of Units. Time is used to define other quantities such as velocity so defining time in terms of such quantities would result in circularity of definition. An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, is highly useful in the conduct of both advanced experiments and everyday affairs of life. The operational definition leaves aside the question whether there is something called time, apart from the counting activity just mentioned, that flows and that can be measured. Investigations of a single continuum called spacetime bring questions about space into questions about time, questions that have their roots in the works of early students of natural philosophy.

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Z-Time popular

http://www.maybeck.com/ztime/

Article on the time at 0 degrees longitude. Covers the timezone origin, GMT, UTC, GCT, ZULU and JIG.

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Wikipedia: Time popular

http://en.wikipedia.org/wiki/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.

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Time Zone and Daylight Saving Time Data popular

http://www.twinsun.com/tz/tz-link.htm

A directory of sites providing descriptions of civil timekeeping concepts, source code, databases, and maps.

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Time FAQ popular

http://www.faqs.org/faqs/astronomy/faq/part3/

Frequently Asked Questions about time (from sci.astro news group)

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Time popular

http://scienceworld.wolfram.com/astronomy/Time.html

Provides descriptions of several standards of time.

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This Day In History popular

http://www.history.com/this-day-in-history.do

Today in history every day - often with pictures and sound.

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NPR : 'Seize the Daylight': A History of Clock Chaos popular

http://www.npr.org/templates/story/story.php?storyId=4572036

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]

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NIST Time and Frequency Division popular

http://tf.nist.gov/

The National Institute of Standards and Technology maintains time and frequency standards for the United States.

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Internet Encyclopedia of Philosophy: Time popular

http://www.iep.utm.edu/t/time.htm

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.

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Infoplease: Daylight Saving Time popular

http://www.infoplease.com/spot/daylight1.html

Information and history about Daylight Saving Time all over the world.

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English Calendar popular

http://www.albion.edu/english/calendar/

Includes an ecclesiastical calendar and a section on old and new style dating.

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Calendar Zone popular

http://www.calendarzone.com/

A categorized collection of calendar related sites.

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Calendar Studies popular

http://www.hermetic.ch/cal_stud.htm

Information about calendar history and calendar reform.

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A Walk Through Time popular

http://physics.nist.gov/GenInt/Time/time.html

Evolution of timekeeping through the centuries.

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A History of Time popular

http://www-history.mcs.st-andrews.ac.uk/HistTopics/Time_1.html

Explains the importance of concept of time in the history of mathematics, science and measurement.

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