|
San Cristóbal Lighthouse
__NOTOC__ The San Cristóbal Lighthouse () is an active lighthouse on the Spanish island of La Gomera in the Canary islands. The current lighthouse is the second to have been constructed on the rocky headland of Punta de San Cristóbal (Saint Christopher's Point), on the eastern side of the island, overlooking the approaches to San Sebastián de La Gomera, the main port and capital of La Gomera. Description San Cristóbal was commissioned as part of the second maritime lighting plan for the Canaries, and is the oldest and principal lighthouse of La Gomera. Construction of the first lighthouse began in 1900 and it became operational in 1903. Designed by the engineer by Juan de León y Castillo, it was built in a similar style to other early Canarian lights, consisting of a whitewashed single-storey keeper's house, with dark volcanic rock used for the masonry detailing. The light was shown from a lantern room at the top of a masonry tower, which was attached to the seaward sid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light Characteristic
A light characteristic is all of the properties that make a particular somewhat navigational light identifiable. 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. Abbreviations While light characteristics can be described in prose, e.g. "Flashing white every two seconds", lists of lights and navigation chart annotations use abbreviations. The abbreviation notation is slightly different from one light list to another, with dots added or removed, but it usually follows a pattern similar to the following (see the chart to the right for examples). * An abbreviation of the type of light, e.g. "Fl." for Flashing, "F." for Fixed. * The color of the light, e.g. "W" for White, "G" for Green, "R" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighthouses In The Canary Islands
A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lens (optics), lenses and to serve as a beacon for navigational aid for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors; they also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and the advent of much cheaper, more sophisticated, and more effective electronic navigational systems. History Ancient lighthouses Before the development of clearly defined ports, mariners were guided by fires built on hilltops. Since elevating the fire would improve visibility, placing the fire on a platform became a practice that led to the development of the lighthouse. In antiquity, the lighthouse functioned more as an entrance marker to ports than as a warning signal for reefs and promontory, prom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Lighthouses In The Canary Islands
This is a list of lighthouses in the Canary Islands. The Spain, Spanish archipelago lies to the west of Africa, in the Atlantic Ocean. Lighthouses Map See also * List of lighthouses in Spain * List of lighthouses in the Balearic Islands References External links * {{DEFAULTSORT:Canary Islands Lighthouses in the Canary Islands, * Lists of lighthouses in Spain Canary Islands-related lists, Lighthouses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Lighthouses In Spain
This is a list of lighthouses in Spain. Lighthouses By autonomous communities * List of lighthouses in the Balearic Islands * List of lighthouses in the Canary Islands See also * Lists of lighthouses and lightvessels This article contains links to lists of lighthouses around the world. According to ''Lighthouse Directory'', there are more than 18,600 lighthouses worldwide. Africa *''Note: Click on the country or place name of your choice in the table belo ... * List of tallest lighthouses References External links {{Architecture of Spain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santa Cruz De Tenerife
Santa Cruz de Tenerife (; locally ), commonly abbreviated as Santa Cruz, is a city, the capital of the island of Tenerife, Province of Santa Cruz de Tenerife, and one of the capitals of the Canary Islands, along with Las Palmas. Santa Cruz has a population of 211,436 (2024) within its administrative limits.Instituto Canario de Estadística , population The Larger Urban Zones, urban zone of Santa Cruz extends beyond the city limits with a population of 507,306 and 538,000 within urban area. It is the second largest city in the Canary Islands and the main city on the island of Tenerife, with nearly half of the island's population living in or around it. Santa Cruz is located in the northeast quadrant of Tenerife, off the north-western c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Port Authority
A port authority (less commonly a port district) is a governmental or quasi-governmental public authority for a special-purpose district usually formed by a legislative body (or bodies) to operate ports and other transportation infrastructure. In Canada, the federal Minister of Transport selects the local chief executive board member and the rest of the board is appointed at the recommendation of port users to the federal Minister; while all Canadian port authorities have a federal or Crown charter called ''letters patent''. Numerous Caribbean nations have port authorities, including those of Aruba, British Virgin Islands, Bahamas, Jamaica, Cayman Islands, Trinidad and Tobago, St. Lucia, St. Maarten, St. Vincent and the Grenadines. Central and South America also have port agencies such as ''autoridad'' and ''consorcio'' (authority and consortium). In Mexico, the federal government created sixteen port administrations in 1994–1995 called ''Administración Portuaria Integral' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Geospatial-Intelligence Agency
The National Geospatial-Intelligence Agency (NGA) is a combat support agency within the United States Department of Defense whose primary mission is collecting, analyzing, and distributing geospatial intelligence (GEOINT) to support national security. Founded in 1996 as the National Imagery and Mapping Agency (NIMA), it changed names in 2003. It is a member of the United States Intelligence Community. NGA headquarters, also known as NGA Campus East or NCE, is located at Fort Belvoir North Area in Springfield, Virginia. At , it is the third-largest government building in the Washington metropolitan area after the Pentagon and the Ronald Reagan Building and International Trade Center, Ronald Reagan Building. The agency also operates NGA Campus West, or NCW, in St. Louis, Missouri, and support and liaison offices worldwide. NGA also helps respond to natural and manmade disasters, helps with security planning for major events such as the Olympic Games, disseminates maritime safety ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fresnel Lens
A Fresnel lens ( ; ; or ) is a type of composite compact lens (optics), lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections. The simpler Dioptrics, dioptric (purely refraction, refractive) form of the lens was first proposed by Georges-Louis Leclerc, Comte de Buffon, and independently reinvented by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses. The Catadioptric system, catadioptric (combining refraction and reflection) form of the lens, entirely invented by Fresnel, has outer Prism (optics), prismatic elements that use total internal reflection as well as refraction to capture more oblique light from the light source and add it to the beam, making it visible at greater distances. The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Gomera
La Gomera () is one of Spain's Canary Islands, in the Atlantic Ocean off the coast of Africa. With an area of , it is the third-smallest of the archipelago's eight main islands. It belongs to the province of Santa Cruz de Tenerife. La Gomera is the third least populous of the eight main Canary Islands, with 22,361 inhabitants at the start of 2023. Its capital is San Sebastián de La Gomera, where the ''cabildo insular'' (island council) is located. Political organisation La Gomera is part of the province of Santa Cruz de Tenerife. It is divided into six List of municipalities in Santa Cruz de Tenerife, municipalities: The island government (''cabildo insular'') is in the capital, San Sebastián. Geography The island is of volcano, volcanic origin and roughly circular; it is about in diameter. List of mountains of La Gomera, It is very mountainous and steeply sloping and rises to at its highest peak, Alto de Garajonay. Its shape is rather like an orange that has been cut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nautical Miles
A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. Historically, it was defined as the meridian arc length corresponding to one minute ( of a degree) of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees). Today the international nautical mile is defined as exactly . The derived unit of speed is the knot, one nautical mile per hour. Unit symbol There is no single internationally agreed symbol, with several symbols in use. * NM is used by the International Civil Aviation Organization. * nmi is used by the Institute of Electrical and Electronics Engineers and the United States Government Publishing Office. * M is used as the abbreviation for the nautical mile by the International Hydrographic Organization. * nm is a non-standard abbreviation used in many maritime applications and texts, including U.S. Government Coast Pilot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Palma
La Palma (, ), also known as ''La isla bonita'' () and historically San Miguel de La Palma, is the most northwesterly island of the Canary Islands, a Spanish autonomous community and archipelago in Macaronesia in the North Atlantic Ocean. La Palma has an area of making it the fifth largest of the eight main Canary Islands. The total population at the start of 2023 was 84,338, of whom 15,522 lived in the capital, Santa Cruz de La Palma and 20,375 in Los Llanos de Aridane. Its highest mountain is the Roque de los Muchachos, at , being second among the peaks of the Canaries after the Teide massif on Tenerife. In 1815, the German geologist Leopold von Buch visited the Canary Islands. It was as a result of his visit to Tenerife, where he visited the Las Cañadas caldera, and then later to La Palma, where he visited the Taburiente caldera, that the Spanish word for cauldron or large cooking pot – "caldera" – was introduced into the geological vocabulary. In the center of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
