Philippi Lansbergii Triangvlorvm geometriae libri qvatvor : in quibus novâ & perspicuâ methodo, & apodeixei [romanized], tota ipsorum triangulorum doctrina explicatur .. (1631)
Lansberge, Philippe van, 1561-1632 · Amsterdami : Apud Gvilielmvm Blaevw · leaf 128
124. GEOMETRIE TRIANGVLORVM los & €8 C 5. erit becper 4 undecim Enucli- … fnt poi circu& B GD F , | ex poli definitione ; per quos seceJario tranfit erreulus AB C D, per comver[am. decimaotlaue undectmi elegsentortm. — ctaqueemaximus Sphaera circulus A BC D, "maxi 3s) B GD F ormalis, tranfit per polos ejus : quod evat deman[hrandum, IIOPIEMATA dw. Itaque demiffus à polo…
Trigonometry -- Early works to 1800
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
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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-162-91.webp)
