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Celestial navigation provides a backup method for determining position when electronic instruments fail.1:27 In the Northern Hemisphere, Polaris serves as a primary reference for finding North and calculating latitude, as its altitude above the horizon corresponds to the observer's latitude.6:31 In the Southern Hemisphere, navigators locate the South Celestial Pole by extending the long axis of the Southern Cross (Cruzeiro do Sul) and intersecting it with a perpendicular line drawn between the stars Alpha Centauri and Beta Centauri.8:31 Latitude in the Southern Hemisphere can be estimated by measuring the angular distance between the South Celestial Pole and the horizon using a closed fist, where each fist width represents approximately 10 degrees.9:46 The SkyView mobile application assists in identifying constellations and stars for those learning these techniques.5:47 While sextants or quadrants provide greater precision for latitude, calculating longitude remains complex, requiring accurate timekeeping and consistent observation of stellar transit times.10:43 Celestial navigation relies on observation and manual calculation, which are inherently prone to error compared to modern GPS technology.12:10

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