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Baris 15: ==Referensi== {{cite book \| first = Nathaniel \| last = Bowditch \| authorlink = Nathaniel Bowditch \| title = The American Practical Navigator \| publisher = [[National Imagery and Mapping Agency]] \| url = http://www.irbs.com/bowditch/ \| location= Bethesda, MD \| year = 2002 \| isbn = 0-939837-54-4 }} {{cite book \|author=MacEwen, William A.; William Hayler; Turpin, Edward A. \|title=Merchant Marine officers' handbook: based on the original edition by Edward A. Turpin and William A. MacEwen \|publisher=Cornell Maritime Press \|location=Cambridge, Md \|year=1989 \|pages=46–51 \|edition= 5th\|isbn=0-87033-379-8 \|oclc= \|doi= \|accessdate=}} {{commons category\|Celestial spheres}}

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