The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ... (1754)
Robertson, J. (John), 1712-1776, Adams, Charles Francis, 1807-1886, former owner. BRL, Adams, John, 1735-1826, former owner. BRL, Boston Public Library) John Adams Library BRL · London : Printed for J. Nourse ... · leaf 105
gs, Miles, Leagues, &c. The angles of triangles are eftimated by circular meafure, that is, byarcs containing Degrees, Minutes, Seconds, &c. (106); and for con-venience thefe circular meafures are reprefented by right lines, calledright fines, tangents, fecants, and verfed fines* M 2 2qP-… … F Thus ah is the right fine of the arc AG ; and alfoof the arc dba. 299. The Tangent of an arc, is a right lineG touching one end of the arc, and continued till it meets a right line drawn from the centre thro the other end of that arc.^ Thus gf is the tangent of the arc ga, 300. The Secant of an…
Navigation · Nautical astronomy · Fortification
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-86-63.webp)
