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Nathaniel Bowditch, Application of Napier's Rules for Solving the Cases of Right-Angled Spheric Trigonometry to Several Cases of Oblique-Angled Spheric Trigonometry, Memoirs of the American Academy of Arts and Sciences, Vol. 3, No. 1 (1809), pp. 33-37
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Nathaniel Bowditch (1809) studied this question.
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