 | 1835 - 700 pages
...same comet has ever appeared before? and the only means which he possesses of answering this enquiry is, by ascertaining, from such observations as may...the parabola, and hyperbola so closely resemble one * Even if the orbit were circular, with the sun in the centre, it would * be incompatible with the... | |
 | Robert Walsh, Eliakim Littell, John Jay Smith - 1835 - 1138 pages
...be found to be an ellipse, then the return of the comet would be certain, and the time of the reiurn would be known by the magnitude of the ellipse. If...hyperbola so closely resemble one another, that no observations can be obtained with sufficient accuracy to enable us to distinguish one from the other.... | |
 | 1840 - 460 pages
...should not be able to determine the nature of its path. The only part of the course of a comet that can ever be visible is a portion throughout which...ellipse, the parabola, and hyperbola, so closely resemble each other that no observations can be obtained with sufficient accuracy to enable us to distinguish... | |
 | Dionysius Lardner - 1846 - 628 pages
...that the only part of the course of a comet which ever can be visible, is a portion such as D, L, G, throughout which the ellipse, the parabola, and hyperbola so closely resemble one another, that no observations can be obtained with sufficient accuracy to enable us to distinguish one from the other.... | |
 | Thomas Dick - 1850 - 586 pages
...кЬо-ild not be able to determine the nature of its path. The only part of the course of a comet that can ever be visible is a portion throughout which...ellipse, the parabola, and hyperbola, so closely resemble each other that no observations can be obtained with sufficient accuracy to enable us to distinguish... | |
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If the path, on the other hand, should appear to be either a parabola or hyperbola, then it would be equally certain that the comet had never been before in our system, and would never return to it. But a difficulty of a peculiar nature obstructs the... 