The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific (1919)
Astronomical Society of the Pacific, Aitken, Robert Grant, 1864-1951 · San Francisco Stanford University Press · leaf 64
in thegreat stellar system are distributed more or less irregularly,but their average distance apart is of the order of six or sevenor eight light-years. All of the stars are in motion, and our own star, the Sun,is no exception to the rule. It is one of the well-establishedfacts of astronomy that… … Fig. 1. Characteristic Forms of Orbits. It is well known that the orbits of our planets are ellipseswhich do not differ greatly from the circular form. Thecomets, on the other hand, move in very elongated orbitsaround the Sun. The orbits of some comets are easilyrecognized as ellipses, but for the…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
