m, as betweene the lines to which they are equall. 6 Two lines being giuev tofinde a thirdincontittmli proportion* F lift place both the lines giuen, on both fides of theScttor from the Center, and marke the termes of theirextenfion, then take out the fecond line againe, and toit open the… … Let the ttvo lines giuen be A B,A C,which Jtake out andplace on both fides of the Sector, fo^asthey all meete in thecenter A, let the termes of the firft line be B and B, thetermes of the fecond C and C.Then doe I take out AC thefecond line againe, and to it open the Sector in the termesBB. So the…
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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-84-59.webp)
