the Radius, the other leg a Tangent,andthe Hypotenufa {or fide fubt ending the right angle) a Secant, IN the rectangular triangle A C B, from the angular point B, and withchediftanceofthelcgBC, let the periphery DC be defcribed, thenfliall BC be the radius, AC a tangent, and AB afecant of…
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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-60-36.webp)
