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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    | Lrigonometrie: And let there be required the Suns azimuth from the North, De. Firlt, for the angle BD A; The Poles elevation compl, AD. 51.deg-32’sc A.D 9.8 937452: Zhe hour from 60%, AD 56 26 # A 10,17817 97. The firf angle found BDA4o 17tcBDA 1O.C7I8640, Secondly, for B DE the proportion is, : . COVAY, OF As tang, of che Poles elevation, tc AD t $1.32 QtAD. 9.900085 TD DES? «285 9.803 6106- fo fine com, the Srft angle found, sc BDA & S49. 43 928824428. to fine comp], the feeond, icBDEQTC 4l 9.5861589 ; 7 he fumme or remainer of tha.firft.and fecond 1 found, namely, of BD A and B DE, w the.angle requined ButheretoB D Agog. 19’ adding BDE 67 19 The fumme isD. 197, 36. the Suns azimuth required. 2. Example | Let there be given in the fixth Triangle, The peles elevation, complement AT), 51 deg. 32? The fans azimnth from the meridian, the acute angle, A, 72 24. The funs declination ; compl, ED,15. to And let there be required the hour from noon D.. Firft, for the angle B.D A. The poles elevation compl. AD51d-32'seAD. 9.89 37452 The fuxs azimuth, A. 72. 24.¢°A, 10-4986 412- The firft angle found,, BDA 22 03 teBDA. 10.3923864 : Secondly, for BD E the proportion is, d % $c. ar. or As tang. of the poleselevation, | tc AD E§t-32. UtADg.9o00865 te tang. of che funs declination, tc EDC 2 Yt 15-10 9-43 30804. fo fine com, of the firkt angle fcund, s¢B D APS. § 67-57 9.9670125 | ty fine compl, the fecond. SSB DES Stay 37 5 9.3 001794 . So that BDE is 78 d..29[Or ifunto BDA 22-03. You- From whichtake BD Aa2 o3/addco.BDEx I-31. The fum. The remainer is. D. 56° 26lisco/ D33 -34 the ho. fromé. Which 5 6deo.26 converted into time, is 3 ho, 45-44 from | noon, thatis, 14’ 16” after § of the clock in the forenoon, or “AS ‘gg’? after 3 of the clock jn the afternoon, ie « . And %