Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 274
respective direc-tions are known, about one-half have a retrograde, andthe other a direct motion. 613. Elements—Identity. Three good observa-tions of the right ascension and declination of a comet,together with the times at which they were made, aresufficient to enable the astronomer to calculate… … and from this point it stretches away in two branches BA and BC to aninfinite length, the branches continually diverging from each other. Abody n oving along this curve from any point of it can therefore neverreturn to the place whence it started. This curve does not return intoitself. 1. The…
Astronomy
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