Search results
Results from the WOW.Com Content Network
The minimum height is calculated by trigonometry (see Distance to the horizon) as =, where H is the height above water in feet, and D is the distance from the lighthouse to the horizon in nautical miles, the lighthouse range.
One of the oldest working lighthouses in Europe is Hook Lighthouse, located at Hook Head in County Wexford, Ireland. It was built during the Middle Ages in a sturdy, circular design. A century later, in the Late Middle Ages, a 40-foot (12 m) tower was built by Edward the Black Prince at Cordouan near the Gironde estuary.
Lighthouses do often have well designed plans specified for the environmental risks in their area. Common risks include land erosion, landslides, hurricanes, flooding, and earthquake. [ 16 ] Past disasters include being "swept away by tsunamis, destroyed by hurricanes, toppled by erosion, gutted by fire, even targeted by weapons of war."
South Foreland lighthouse. South Foreland Lighthouse is a Victorian-era lighthouse on the South Foreland in St. Margaret's Bay, which was once used to warn ships approaching the nearby Goodwin Sands. [31] Goodwin Sands is a 10-mile-long (16 km) sandbank at the southern end of the North Sea lying six miles (10 km) off the Deal coast. [31]
Graphical and textual descriptions of navigational light sequences and colours are displayed on nautical charts and in Light Lists with the chart symbol for a lighthouse, lightvessel, buoy or sea mark with a light on it. Different lights use different colours, frequencies and light patterns, so mariners can identify which light they are seeing. [1]
The Georgetown Lighthouse was first built by the Dutch in 1817 and then rebuilt in 1830 to help guide ships into the Demerara River from the Atlantic Ocean. The 31 m (103 feet) high octagonal structure is a famous Georgetown, Guyana landmark with its distinct vertical red and white stripes.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Due to erosion of the shore, the lighthouse was just 15 feet (4.6 m) from the water's edge and was in imminent danger. The move was a total distance of 2,900 feet (880 m) to the southwest, placing the lighthouse 1,500 feet (460 m) from the current shoreline. All other support buildings at the site were also moved at the same time.