The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 256
right triangle can be solved when any twoparts in addition to the right angle are given. The solution iseffected by means of the formulae given in the preceding articles. ANALYTIC GEOMETRY. 18. The circle, the ellipse, the hyperbola, and the parabola areoften called conic sections; since eachcurve… … ANALYTIC GEOMETRY. 245 sum of the distances of the point M from the two fixed points Fand F is always constant, wherever on the curve A CBD thepoint M may be situated. The two fixed points are called the foci of the ellipse, and themiddle point of the line which joins them is called the centre. A…
Astronomy
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![An illustration from Sidereus nuncius : magna, longeque admirabilia spectacula pandens, suspiciendaque proponens vnicuique, praesertim verò philosophis, atq[ue] astronomis, quae à Galileo Galileo ... perspicilli nuper à se reperti beneficio sunt obseruata in lunae facie, fixis innumeris, lacteo circulo, stellis nebulosis, apprime verò in quatuor planetis circa Iouis stellam disparibus interuallis, atque periodis, celeritate mirabili circumuolutis; quos, nemini in hanc vsque diem cognitos, nouissimè author depraehendit primus; atque Medicea sidera nuncupandos decreuit (1610)](https://img.insideoutlibrary.com/img/200/ia-sidereusnunciusm00gali-31-11.webp)
