A lighthouse (often called a beacon or light tower) is a tall structure designed to emit light from a system of lamps and lenses as a navigational aid to seafarers, marking dangerous coastlines, hazardous shoals, reefs, rocks and safe entries into harbors. They also assist aerial navigation. Some lighthouses incorporate other aids to navigation such as DGPS, radar or sonar depth-finders.
This wiki article is a compilation of information about lighthouses and efforts to preserve them. It is a work in progress – if you have more information to add, please send it to me!
Although most people agree that a lighthouse is an aid to navigation displaying a light, some definitions differ widely about what constitutes a lighthouse. Some definitions include the notion that a lighthouse must be substantial in size, while others only require that a lighthouse be a lighted aid to navigation.
Most lighthouses are built in remote and often dangerous locations. The ancient world and medieval times largely got by with makeshift devices, but as sea commerce expanded dramatically in the modern period, the loss of ships, lives and cargo escalated until something better was required. The result was the golden age of lighthouse building in the 18th and 19th centuries, when great towers were heroically constructed in perilous locales, housing not only equipment but also people to tend and maintain them.
This wiki article is divided into two separate pages – one describes the properties of lighthouses as buildings, and the other describes the properties of their lights. If possible, each lighthouse should be mapped as both a building and a light.
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