from the center A, then take I outthe fecond B C, and to it open the Sector in 2? and C, thetermes of the firft line. The Sector thus opened to las dueangle, I take out A D and A £,the parts of the firft line A B,and place them alfo on both the fides of the Sector in A DyA .£, fo the parallell D… … required If the line A*B, were longer then one of the fides of theRuler, then mould I findc what proportion it hath to hisparts AD,A£, and that knowne I may worke as before inthe former propofition. 9 Two numbers beinggiuen to findcd thirdin ccfttimalL proportion. FIrft reckon the two numbers giuen…
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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-375-258.webp)
