Which is in effect thefame with the former. PROPOS ITION. II. In all obliqttangled Spherical triangles, the fumme ofwhofe angles at the bafe , are lelfe then a femi-cir-cle, As the fine of the fumme of the angles at the bafe, is to the fine oft heir difference ; So is the tangentof halfthe bafey to… … •,r are acute,and A C B obwfe,!et the fide A C be eqal to A E, and from the angle at A let fall theperpendicular A D, then are the triangles A C D. and A D E equilateral, and cqiti-angled,and C D equal to D E, and in the triangle A B E,the bafe is B E, and B D, and D E, the fummeof the fegments,…
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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-68-46.webp)
