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againſt alſo Angle ACB Angle BAC Angle of Poſition Anſw Anſwer Azimuth Barbadoes Baſe Braſs Meridian Caſe Center Chord Compaſs Courſe and Diſtance Degrees Departure deſcribed Diff Difference of Latitude Difference of Longitude Dominical Letter draw Eaſt Eaſterly Ecliptic equal Equator Equinoëtial Example firſt given Angle Globe greateſt Horizon Hour Hypothenuſe AC Iſland laſt Leg BC leſs Line Lizard Logarithm Longitude the Ship meaſured Merid Minutes muſt neareſt North Number Oblique Circle Oblique Spheric Triangle Obſervation parallel perpendicular Plane Plane Sailing Plate Points Pole Primitive Circle Prob Proportion Quadrant of Altitude Radius Remainder repreſents Right Aſcenſion Right Circle Rule Rumb ſaid ſame Scale Secant ſecond Sečtion ſet ſeveral ſhe ſhew ſheweth Ship ſails Sine Complement South Latitude Spheric Geometry Spheric Triangle Spheric Trigonometry ſubtract Sun's Altitude Sun's Azimuth Sun's Declination Sun's Place Suppoſe Tangent theſe thoſe tude Uſe Weſt Weſterly whoſe
Page 122 - We infer from this that a triangle can be constructed with three given lines as sides, when the sum of any two sides is greater than the third side.
Page 151 - AZIMCTR circles, called azimuths, or vertical circles, are great circles of the sphere, intersecting each other in the zenith and nadir, and cutting the horizon at right angles in all the points thereof.
Page 145 - ... globe. A Strait is a narrow part of the ocean lying between two shores, and opening a way into some sea, as the Straits of Gibraltar that lead into the Mediterranean Sea. A Creek is a small narrow part of the sea or river, that goes up but a little way into the land.
Page 130 - ... the angle CGH (1. PI. Tr.): But since CG, HG are at right angles to DGB, which is the common section of the planes CBD, ABD, the angle CGH will be equal to the inclination of these planes (6.
Page 105 - Difference of Latitude, is to the Difference of Longitude ; fo is the Sine Complement of the Middle Latitude, to the Tangent of the Courfe, or more briefly thus : As Diff.
Page 208 - ... as the radius is to the tangent of the latitude ; so is the tangent of the sun's declination to the sine of the ascensional difference sought. This, converted into time, shows how much he rises...
Page ii - Navigatio Britannica: or, a complete System of Navigation, in all its Branches, both with regard to theory and practice; containing Geometry, Plane and Spherical Trigonometry, Astronomy, and the doctrine of the Sphere, &c.
Page 129 - Is to the cosine of half their difference, So is the cotangent of half the contained angle To the tangent of half the sum of the other angle*.