Recreations in astronomy : with directions for practical experiments and telescopic work (1879)
Warren, Henry White, 1831-1912 · New York : Harper & Brothers · leaf 88
not necessary for two observers to actually sta-tion themselves at two distant parts of the earth inOrder to determine a parallax. If an observer could goin one end of the base-line t<> the other, he couldtermine both angles. Every observer is actually car-_ through space by two motions: one… … Fig. 27. 70 CELESTIAL MEASUREMENTS. the earth (eight thousand miles) for a base-line, but thediameter of the earths orbit (184,000,000 miles), or anypart of it, for such a base. Two observers at the endsof the earths diameter, looking at a star at the same in-stant, would find that it made the same…
Astronomy
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