An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 266
th. In the third place, as there may bea multitude of elliptic orbits, whose perihelion distances are equal,it is obvious that, in the case of very eccentric orbits, the slightestchange in the position of the curve near the vertex, where alonethe comet can be observed, must occasion a very sensible… … 242 COMETS. the comet remains visible from the earth, its effect when diffusedover the whole extent of the orbit, may acquire a most material or€ven a fatal importance. On account of these circumstances, it is found exceedingly diffi-cult to lay down the path which a comet actually follows…
Astronomy
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