A popular history of astronomy during the nineteenth century (1902)
Clerke, Agnes M. (Agnes Mary), 1842-1907 · London : A. and C. Black · leaf 398
ed,at 1° 42 from the head, with a strange excrescence, suggesting thebudding-out of a fresh comet in that incongruous situation.4 Someof these changes, Professor Barnard thought, might possibly beexplained by a rotation of the tail on an axis passing through thenucleus, and Pickering, who formed a… … CHAP. XI RECENT COMETS 369 pendent grounds, assigned about 94 hours as the period ofthe gyrating movement.1 He, moreover, determined accelerativevelocities outward from the sun of definite condensations in thetail, indicating for its materials, on Bredikhines theory, a densityless than one half…
Astronomy
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