Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 240
out 40, and the period 75 years. Itseccentricity is 0.63. Since the distance of a Centauri from theearth is approximately known, we can ob-tain some idea of the dimensions of theorbit. If E in the figure represents the earth,we shall have, in the right-angled triangleCOE, the angle E equal to 20,… … 228 COLORED STARS. Again, knowing the radius of the orbit and the period, wecan obtain an approximate value of the mass of a Centaurifrom the formula in Art. 214. It will be found to be about twice the mass of the sun. COLORED STARS. 285. Many of the stars, both isolated and double, shine witha…
Astronomy
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-343-39.webp)
