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].

  • Norwood, Richard, 1590?-1675.
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 ~ * Rules for finding the lavitude or Poles elevation by the nseridian al= titude of the Sum or Stars 5 and by the Table of their Declinations beforegoing. Cafel.. Lf the Sun or Starve be on the Adoridian to the fouthwards,. and have foush declination. | Adde the Suns:declination. to his meridian altitude , and taking: that total from go degrees, the remainder is the latitude, or the poles: elevation northerly... ne 3 Keke he: As-admitupon the 10 of Fansary, 1649, 1 finde by the foregoing . tables, The Suns declination feutherly 20deg. co’ The Suns meridian alcitude by obfervation PO S56. The.fum or cotal is : . 37 55° f Which fubftra@ed.from. - 89. 60, There remains the latitude northerly 52 05s ’ But when you have added the Suns declination to his meridian al- titude , if the cotal exceed 90 deg, fubftract from it go deg. and the remainder is your latitude tothe fouthwards. | As admit the funs declination to be foutherly 20 deg. 11° . The meridian altitude by obfervation 79 35e- \ | : 6 : The fum or total ) a go 46. , From which fubftrating 90 00. ; ‘There remaines the latitude foutherly oo 6: Cafe 2. Lf the fun or Bar be on the meridian to the fouthwards, i f . have north declination,. ] Subftraé the funs declinatiogiigf@m his meridian altitude, and that 6 which remaines, fub(tract fronmsji@edeg. then that which remaines is i your latitude or elevation northerly, : 4 As.admit upon the 20 of April. 1649, J find: C The funs declination northerly 15 deg, 01 5 The meridian alcitude by obfervation : 64 . 22, | The remainder, fub(traCting the declination is 49 21 yy _.. Which fubftra@ed from. a M89 60. : There remains ‘the latitude northerly SP lige i 38° Cafe 3. Lf the fun or tar be ou the:meridian to the northwards, and: Va have north declination. Addg the Suns declination to his. meridian altitude that total - Stay areg: eB: take.