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hyperphysics

Atomic Clock

Very accurate clocks can be constructed by locking an electronic oscillator to the frequency of an atomic transition.

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http://hyperphysics.phy-astr.gsu.edu/hbase/acloc.html#c1

The story of atomic clocks

A long read about the history of the atomic clocks

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http://www.sciencemuseum.org.uk/onlinestuff/stories/atomic_clocks.aspx

Explore Big History

Interactively explore the timeline of the universe.

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http://www.chronozoomproject.org/

How Atomic Clocks Work

A brief description of how atomic clocks work to keep track of time accurately. From HowStuffWorks.com.

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Hits: 1054

http://www.howstuffworks.com/atomic-clock.htm

How do atomic clocks work?

A great short article on how atomic clocks work from NPL

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Hits: 1033

http://www.npl.co.uk/educate-explore/what-is-the-time/how-do-atomic-clocks-work

The Untold Story of Getting from Here to There | Time and Navigation

A site from the Smithsonian dedicated to exploring the relationship between time and navigation from how sailors needed accurate clocks to determine their longitude to how satellites navigation ...

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Hits: 129

http://timeandnavigation.si.edu/

Fowler's Physics

Various applets allowing results to be taken for demonstration purposes.

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Hits: 1064

http://galileo.phys.virginia.edu/classes/109N/more_stuff/Applets/home.html

Line Rider

A fun toy that lets you build a sledge run and then test it out. You'll need a good feel for the laws of motion to get results!

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Hits: 3534

http://www.linerider.com/

The End of My Latin

Kaufmann's experimental results on deflection of electrons in an electromagnetic field favoured Abraham's theory, not Einstein and Lorentz, but were eventually proved wrong.

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Hits: 1988

http://mathpages.com/rr/s3-06/3-06.htm

How does GPS work?

More information on how GPS satellites calculate your location, from using accurate atomic clocks to ensuring enough coverage.

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http://www.tomtom.com/howdoesitwork/category.php?ID=6&Language=1
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