„- (AMY Now as the right handmember of this equation is known. CM is known; and aspart of it ( MB ) is already known, the other part, B C, thediameter of the earth, thus becomes known. This method would be a very practical one, if it were not objectionfor the uncertainty and variable nature of… … 54 ASTRONOMY. chap, i. A mountain, two miles in perpendicular hight, was seenfrom sea at a distance of 126 miles. If these data are cor-rect, what then is the diameter of the earth Solution; MC=^^- =63x126=7938. 5(7=7936. Dip of the ( 54.) This same geometrical theorem serves to computehorizon. the…
Astronomy
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-388-268.webp)
