The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 66
nownarc of this meridian, of one degree, for instance, we can computethe length of the entire circumference. The determination ofthe earths radius, then, depends only on our ability to satisfythese two conditions: (1.) We must be able to measure the linear distance on theearths surface between two… … Fig. 24. the first of these two conditions may be satisfied. Let A and Grepresent the two points on the same meridian thedistance between which we wish to measure. Wehave already seen (Art. 36) how an altitude andazimuth instrument may be so adjusted that thesight-line of the telescope will lie in…
Astronomy
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