es of►§ jTangents of8 yvhole fineq*\_Tangents of <2IRIIH-IHQF.RJLFM.LG Therefore excluding the intermediate terms. ^KSmesof QJ °lSi»esof RI ° S Tangents of LG %C.Tangetitt of FM And inver-fedly. J^C Situs of R IglSinesof £1° ^Tangents of p,M%(Ta^gentsof LG o And thecontrary. LEMMA. /»i?> *W… … Let the given arch be P E, P C,and their verfed fines P B,PVVtheir difference is B V, the fumme of the given arks E P C, andtheir difference C Y. Alfo let the fine of the half fumme be E Oor O C, and the fines of half the difference CK, I fay that E O,^C K, are mean proportionals between X E, C L.…
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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-329-220.webp)
