Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 58
ly in case it werespherical, the next question is what the observations show.Except for irregularities of the surface, which are not underconsideration here, and the oblateness, which will be dis-cussed in Art. 12, the observations prove absolutely that thechange in direction of the plumb line is… … FiG. 7.- - The base line A\Ai is measured directly and the other distancesare obtained by triangulation. face of the earth, and the second is that of determining thechange in the direction of the plumb line. The first is arefined problem of surveying; the second is solved byobservations of the…
Astronomy
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