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 67
the meridian. If Z is the zenith of thepoint J., the meridian zenith distance of Sat A, reduced to the centre of the earth, isthe angle Z CS. In the same manner thetrue meridian zenith distance of S at G isthe angle ZCS. The difference of these twozenith distances, or the angle ZCZr, is evi-dently… … 62 FORM OF THE EARTH. 63. Results.—By the process above described, or by processesof a similar character, arcs of different meridians, and in differ-ent latitudes, have been carefully measured. The sum of thearcs thus measured is more than 60°, and the length of a degreeof the meridian has been…
Astronomy
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