Star-land; being talks with young people about the wonders of the heavens (1899)
Ball, Robert Stawell, Sir, 1840- [from old catalog] · Boston and London, Ginn & company · leaf 274
be determined if the comet were let alone, which, un-fortunately, is not often the case. Indeed, you mayremember how I told you some of the misadventuresof this very comet when we were speaking about theplanet Mercury. Enckes comet comes round in a periodof a little more than three years, and it… … Fig. 73. —The Orbit of Enckes Comet. At increasing heights above the earths surface thereis gradually less and less air; until at last, at about200 or 300 miles above the surface on which we dwell,there would be none. You might as well try to quenchyour thirst by drinking out of an empty cup as…
Astronomy
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