A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 317
number, as follows: — 1. The semi-major axis, a. 2. The eccentricity, e. 3. The inclination to the ecliptic, i. 1. The longitude of the ascending node, Q. 5. The longitude of perihelion, -k. 6. The epoch, E. 7. The period P, or daily motion p. 506. Of these, the first five pertain to the orbit… … Fig. 165. —The Elements of a Planets Orbit. orbit, and may be expressed either in ••astronomical units (theearths mean distance from the sun is the astronomical unit) or inmiles. The Eccentrieity defines the orbits Form. It is a mere numerical quantity, being the fraction - (usually expressed…
Astronomy
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