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CHAPTER XIII.

APPLICATIONS OF SPHERICAL TRIGONOMETRY.

222. Astronomical Definitions..

223. Spherical Coördinates...

224. Graphic Representation of the Spherical Coördinates..

225. Problems.....

226. The Chordal Triangle...

227. Legendre's Theorem..

228. Roy's Rule......

229. Reduction of an Angle to the Horizon

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