Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 310
n, and in that portionthe differences between an ellipse, parabola, and hyperbola aresmall (Fig. 84) : also a comet, being diffuse, cannot be observedwith the same accuracy as a planet. When the orbit has beendetermined as a parabola, the logical inference is, therefore,that its eccentricity is so… … 268 GENERAL ASTRONOMY were not sufficiently accurate or consistent to justify theassumption of a hyperbolic orbit, or that the hyperbolic orbithad been caused by planetary perturbations. There thusseems to be no conclusive evidence of any comet havingentered the solar system from outside. This is…
Astronomy
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