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 297
oximately propor-tional to the intervals only if these intervals are comparativelysmall. The distance from S to A is called the perihelion dis-tance (q), because at A the body passes around the Sun. Thedistance from the center to either vertex is called the semi-major axis. The Sun is at the focus… … Fig. 13. Ellipse, Parabola and Hyperbola. axis, but its shape, whether circular or flat, depends upon theeccentricity. The semi-major axis and the eccentricity formtwo of the earmarks or elements of the orbit. For the ellipsethe eccentricity is less, for the hyperbola greater than unity,for the…
Astronomy
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