Trigonometrie. Or, the doctrine of triangles: divided into two books. The first shewing the mensuration of right lined triangles: the second of spherical ... Both performed by that late and excellent invention of logarithms ... Whereunto is annexed (chiefly for the use of sea-men) a treatise of the application thereof in the three principal kinds of sailing. With exact tables of the suns declination ... and tables of the right ascension and declination of some eminent fixed stars ... Also other necessary tables used in navigation / [Richard Norwood].

  • Richard Norwood
Date:
1661
Catalogue details

Licence: Public Domain Mark

Credit: Trigonometrie. Or, the doctrine of triangles: divided into two books. The first shewing the mensuration of right lined triangles: the second of spherical ... Both performed by that late and excellent invention of logarithms ... Whereunto is annexed (chiefly for the use of sea-men) a treatise of the application thereof in the three principal kinds of sailing. With exact tables of the suns declination ... and tables of the right ascension and declination of some eminent fixed stars ... Also other necessary tables used in navigation / [Richard Norwood]. Source: Wellcome Collection.

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    i H nt t +H] | a if U t ai ay | } i fea ves Bit Fil 1 sf i i a MG Reg | re A Ve We hal ~ eh {i v4 ye es Mere rg! ‘ “yf Firft, for the angle BD A. . The Suns azimuth, A 92, ;:24t A. 10-4986412 ‘Secondly, for BD E, the proportion is, As finecomp!,the azimuth, = * , SCA'g ¢ 5$17.d.36/ C0, ar. O.5194655 to fine compl. the hour from noon,’ s¢ E ‘we D533 34 9°7426520 fo the fine of the firft angle found, sB DA ~ SjO 35 9+7 065394 -to the fine of the fecond, sBDE $68 30 9.9686 529 The fumme or remainder of the firlt and fecond: angle found BD Aand BD, is the.angle D-required.. But-in this.example, From B DE. 68 d, 30° fubftraéting BDA 30° 35 | The remaineris.D 37 55. the angle of pofition ré- : (quired, After the form of this example, there may five other queftions in this oblique triangle, and [0 in any other be refolved. 2. If inthe firft oblique triangle there be given, The Poles elevation, the hanr from noon, andthe angle of the Suns pofition: to findthe Suns azimuth, : 3 If there were given in the third triangle, find the hour from noon. ‘ | 4. If there were givenin the fourth triangle, The Sunsaltitnde, the angle of pofitiow, ana the hour from noon : te fisd the Suns azimuth... | 5 If inthe fifth triangle there be givens. The (uns declination, the hour from noon, andthe {uns arxinuth: te find the angle of the [uns pofttion- vio 6 If there were giver inthe fixth triangle, tion: to find the hour from noon. - a oe