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 74
Fig. 1—Comets tails lag behind the line joining the Sun (S) and thecomets nuclei. Orbital motion is carrying the nucleus of the cometto the risiht. … Fig. 2—Diagram illustrating the three principal types of tails of comets.Orbital motion is carrying the nucleus to the left. The Sun is below. PLATE VIII. A\hAT Wf. Know About Comets 37 ()ur second question is. What are comets?Comets have certain characteristic features: 1. There is always a head,…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
