• New York
  • Lighthouse

New York, often called New York City[a] or NYC, is the most populous city in the United States. With a 2020 population of 8,804,190 distributed over 300.46 square miles (778.2 km2), New York City is also the most densely populated major city in the United States, and is more than twice as populous as second-place Los Angeles. New York City lies at the southern tip of New York State, and constitutes the geographical and demographic center of both the Northeast megalopolis and the New York metropolitan area, the largest metropolitan area in the world by urban landmass. With over 20.1 million people in its metropolitan statistical area and 23.5 million in its combined statistical area as of 2020, New York is one of the world's most populous megacities, and over 58 million people live within 250 mi (400 km) of the city. New York City is a global cultural, financial, entertainment, and media center with a significant influence on commerce, health care and life sciences, research, technology, education, politics, tourism, dining, art, fashion, and sports. Home to the headquarters of the United Nations, New York is an important center for international diplomacy, an established safe haven for global investors, and is sometimes described as the capital of the world.

Lighthouse is a high tower-shaped building, lighting equipment should be installed in the tower, the location should be prominent, and pay attention to its specific architectural shape, easy for ships to distinguish, and become one of the highest points of the port. As the surface of the earth is curved, the tower must have sufficient height so that the light can be seen by long-distance ships, with a general line-of-sight distance of 15-25 nautical miles, but the light should not be too high so as not to be obscured by high clouds. According to the size and location of the lighthouse, the lighthouse can be guarded or unguarded, and important lighthouses should be guarded. ...
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