Astronomy with an opera-glass: a popular introduction to the study of the starry heavens with the simplest of optical instruments, with maps and directions to facilitate the recognition of the constellations and the principal stars visible to the naked eye; (1888)
Serviss, Garrett Putman, 1851-1929 · New York, London, D. Appleton and company · leaf 55
rate, probably, of not less than 160,-000,000 miles in a year—a stupendous voyage through space,of whose destination we are as ignorant as the crew of a shipsailing under sealed orders, and, like whom, we must depend 44 ASTRONOMY WITH AN OPERA-GLASS. upon such inferences as we can draw from courses… … Map 10. either side of Hercules. The reader should note that thepoint overhead in this map is not far from the star Eta (rf) inHercules. The bottom of the map is toward the south, theright-hand side is west, and the left-hand side east. It is im-portant to keep these directions in mind, in…
Astronomy
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