An aid for navigation and pilotage at sea, a lighthouse is a tower building or framework sending out light from a system of lamps and lenses or, in older times, from a fire. More primitive navigational aids were once used such as a fire on top of a hill or cliff (see beacon).

Because of modern navigational aids, the number of operational lighthouses has declined to less than 1,500 worldwide. Lighthouses are used to mark dangerous coastlines, hazardous shoals away from the coast, and safe entries to harbors.

Perhaps the most famous lighthouse in history is the Lighthouse of Alexandria, built on the island of Pharos in ancient Egypt. The name of the island is still used as the noun for "lighthouse" in some languages, for example: French (phare), Italian and Spanish (faro), Portuguese (farol), Romanian (far) and Greek (φάρος). The word "pharology" (study of the lighthouses), is also derived from the island's name.

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Is working hard constructing new things in the Lighthouse Lab, please follow me on http://twitter.com/lighthouselab
SteveFrizza (Stephen Frizza) Sat, 26 Dec 2009 12:18:46 -0000
Is working hard constructing new things in the Lighthouse Lab, please follow me on http://twitter.com/lighthouselab
Lightsails: New world lighthouse, self-powered transmitter and receiver http://digg.com/u1IfGf
eoffice (eOffice News) Sat, 26 Dec 2009 12:16:14 -0000
Lightsails: New world lighthouse, self-powered transmitter and receiver http://digg.com/u1IfGf
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Tiaradewanti (tiara dewanti) Sat, 26 Dec 2009 12:13:18 -0000
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Lighthouse Hockey >> Islanders Gameday: Rivals across the river, prospects across the border http://bit.ly/4DnmTq
islesbuzztap (New York Islanders) Sat, 26 Dec 2009 12:11:39 -0000
Lighthouse Hockey >> Islanders Gameday: Rivals across the river, prospects across the border http://bit.ly/4DnmTq
The past is a lighthouse and not a harbor.
cooler_planet (Carolyn Ashcroft) Sat, 26 Dec 2009 12:02:25 -0000
The past is a lighthouse and not a harbor.
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rtmate2 (RTmate2) Sat, 26 Dec 2009 11:48:02 -0000
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