A System of the Mathematics: Containing the Euclidean Geometry, Plane & Spherical Trigonometry ... Astronomy, the Use of the Globes & Navigation ... Also a Table of Meridional Parts ... Together with a Large & Very Useful Table of the Latitudes & Longitudes of Places, Volum 2
T. Page, W. & F. Mount, 1723
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A System of the Mathematics: Containing the Euclidean Geometry, Plane ...
Ingen forhåndsvisning tilgjengelig - 2017
2d Triangle 3d of Problem adjacent Angle alſo Altitude Anſwer Aſcenſional Difference Axiom Azimuth Baſe becauſe Caſe of Right-angled Caſe the 3d Center Clock Hour Circle Co-ſine Co-tangent Complement conſequently deſcribe diſtance draw Eaſt Ecliptic equal Equator Extreams firſt point greateſt half Sum half the Sum Horizon Hypothenuſe IO.OOOOOOO Latitude leſs Longitude meaſured by Caſe Meridian muſt North Number Oblique Oblique-angled Spherical Triangle Obſervation oo ſec oppoſite Parallax Parallel paſſing thro Perpendicular Place Plane point of Aries Pole preſent Declination Prime Vertical Primitive Circle Prob Problem the 7th Projećtion Quadrant Radius repreſent Right Aſcenſion Right-angled Spherical Triangles Riſing and Setting ſame manner Seáion Sečiion Semi-tangent ſet ſeveral ſhall Side BC Sine of half Six a Clock Small Circle Star Stereographic Solution Tangent theſe thoſe Triangle ABC Uſe viſible Weſt whence to find wherefore Zenith
Side 131 - As the sine of half the sum of the two sides is to the sine of half their difference so is the cotangent of half their contained angle to the tangent of half the difference of the other angles ; and again, 2.
Side 134 - If, from an angle of a spherical triangle, there be drawn a perpendicular to the opposite side or base, the tangent of half the sum of the segments of the base is to the tangent of half the sum of the...
Side 58 - I. The sine of the middle part is equal to the product of the tangents of the adjacent parts.
Side 59 - In a right angled spherical triangle, the rectangle under the radius and the sine of the middle part, is equal to the rectangle under the tangents of the adjacent parts ; or', to the rectangle under the cosines of the opposite parts.
Side 131 - 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*.
Side 215 - Equator, e-kwaytur (Latin, œqueo, to divide equally). A great circle of the sphere, equally distant from the two poles of the world, and dividing it into two hemispheres, the northern and southern. It is called the equator, because when the sun is in this circle the days and nights are of equal duration in all parts of the world. From this circle the latitude of places, whether north or south, is reckoned, in degrees of the meridian ; the longitude of places is reckoned in degrees around this circle....
Side 8 - Projeftiott the Angles made by the Circles on the Surface of the Sphere are equal to the Angles made by their Reprefentatiyes on the plane of the Projection.
Side 63 - The exact length of the base being ascertained, and a system of triangles built upon it adapted to and covering the country to be surveyed, the lengths of all the other sides of the triangles in the system are inferred from the familiar theorem that " every triangle has six elements or functions, viz., three sides and three angles, any three of which being known (one being a side), the other unknown elements may be computed" with a degree of precision of the same order as that of the known elements.