usA D, A B.Erunt edam arcus I R,I Q Sinus complemen-torum anguloium verticalium C A D, C A B, quorummenfurse funt L I, 1F. Ajo itaque Sinus I R, I Q com-plementorum angulorum verticalium, Tangentibusla-terum F M, L G reciproce proportionales effe. Suntcnim per Axìoma z. .Smus QJ.RI. Ergo ex- ^… … LEM- 1% TJIIGONOMETJII^E AXJIFICIA LIS LEMMA. Datis duorum arcuum Sinubusverjìs, erunt Sinus retti [emifumma 6[emidiferenti* eo-mndem arcuum.mediìproportionales inter Sinum Totum 6 [emiffem differenti^ Sinuuntverforum. Sunto arcus dati P E, P C & eorura Sinus verfiPB,P V, quorum differentia eft…
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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-62-38.webp)
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