m of two arches together leffe then a Semii irele, is to the dif-ference of the fines, as the half Radius is to the fine of half the difference. Demiti(ha<->*. Let the given arches (/»the following Daaram) be D F and F E, their fines areDM and EN, and D L is the difference of thofe fines, E F… … the rickand AB Ingonomeiria BrkmnkA e 19 The right fines of the half fum and half difference of two arches are mean proportionalsbetween the whole Sine and the half difference of the verfed fines. Demonftration. C Let the given arches be D F and F E, and their verfedfines M F and F N, their…
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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-166-93.webp)
