Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 260
ratio of the circumferenceof a circle to its diameter, or 3.1416. The compression, or oblaieness, of an oblate spheroid is theratio of the difference between the major and the minor axis ofthe generating ellipse to the major axis. 21. The hyperbola is a plane curve, in which the difference ofthe… … 246 APPENDIX. The two fixed points are called the foci, and the middle pointof the line joining them is called the centre. 22. The parabola is a plane curve, everypoint of which is equally distant from afixed point, and from a right line given inthe plane. Thus, in Fig. 83, in which ABis the given…
Astronomy
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