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The star Polaris, often called either the "Pole Star" or the "North Star", is treated specially due to its proximity to the north celestial pole. When navigating in the Northern Hemisphere , a simple and quick technique can be used with Polaris to determine the observers latitude or, for larger maritime vessels can be used to calculate any ...
Currently the US Authorized Application Service Provider (ASP) is Pole Star Space Applications Ltd.. LRIT was proposed by the United States Coast Guard (USCG) at the International Maritime Organization (IMO) in London during the aftermath of the September 11, 2001 attacks to track the approximately 50,000 large ships around the world.
NLV Pole Star is a lighthouse tender operated by the Northern Lighthouse Board (NLB), the body responsible for the operation of lighthouses and marine navigation aids around the coasts of Scotland and the Isle of Man. Pole Star was joined by a new vessel, NLV Pharos in March 2007, which replaced the previous vessel of the same name. [3]
A pole star is a visible star that is approximately aligned with the axis of rotation of an astronomical body; that is, a star whose apparent position is close to one of the celestial poles. On Earth , a pole star would lie directly overhead when viewed from the North or the South Pole .
It is designated α Ursae Minoris (Latinized to Alpha Ursae Minoris) and is commonly called the North Star or Pole Star. With an apparent magnitude that fluctuates around 1.98, [ 3 ] it is the brightest star in the constellation and is readily visible to the naked eye at night. [ 15 ]
A diagram of a typical nautical sextant, a tool used in celestial navigation to measure the angle between two objects viewed by means of its optical sight. Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the ...
The latitude of the North Pole is 90° N, and the latitude of the South Pole is 90° S. [17] Mariners calculated latitude in the Northern Hemisphere by sighting the pole star with a sextant and using sight reduction tables to correct for height of eye and atmospheric refraction. The height of Polaris in degrees above the horizon is the latitude ...
USCGC Polar Star (WAGB-10) is a United States Coast Guard heavy icebreaker. Commissioned in 1976, the ship was built by Lockheed Shipbuilding and Construction Company of Seattle , Washington along with sister ship , USCGC Polar Sea .