Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 80
1416 ;it is found to be a little more than 7,900miles. Again, if we denote the length of 1°of the meridian by d, we have the pro-portion n° : I :: 1° : d; „••. d = —. Explanation. AC is the measured arc, I;QEA is the latitude of A : and QEC is thelatitude of C Fig 2g When the lengths of a degree of… … 76 ASTHOKOMY. grow flatter as they approach the poles. From a great num-ber of arcs measured in different latitudes and on differentmeridians it has been shown that the true form of the earthis that of an oblate spheroid, that is, of a volume generatedby revolving an ellipse around its shorter…
Astronomy
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