Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 105
n the meridian, let the station through whichit passes be called the principal station, and the course whichbegins at this point, the first course. Care, however, must hetaken not to confound this luith the cotcrse which begins atstation 1, and which is the first course that is entered in… … M C Fio. 70. 135. To deduce a rule for finding the double meridian dis-tance of any course. Let SN be the assumed meridian. LetBG represent any course, and AB the preceding course; also,let D and B be their middle points. Draw BH, BG, and CM,perpendicular to the assumed meridianNS. Draw also Al,…
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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-56-31.webp)
