Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 85
t the equator does really bulge in this way is shown by measuring the length of adegree of latitude on the va-rious parts of the eartKssurface between the equatorand the pole, in the mannerindicated a few pages back(Art. 105). More thantwenty such arcs have beenmeasured, and it appearsthat the… … At lat. 20° a a = 68.786 « « 4.Q0 a a = 68.993 60° a a = 69.230 « 80° a u = 69.386 At the pole, u a = 69.407 « The difference between the equatorial and polar degree oflatitude is more than 0.7 of a mile, or over 3700 feet, whilethe probable error of measurement cannot exceed a foot ortwo to the…
Astronomy
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