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Some Considerations
of Mr. Nic. Mercator, concerning the Geometrick and direct Method of Signior Cassini for finding the Apogees, Excentricities, and Anomalies of the Planets; as that was printed in the Journal des Scavans of Septemb. 2. 1669: which Considerations are here delivered in the Latine Tongue, wherein they were written by the Author, as chiefly regarding the Learn'd in Astronomy, viz.
Clarissimi Cassini Methodus
Inc/ffigdndi Apvgéa, Excentricimtes ed /Inomulifu Planctamm, irevirer Expqim 65° Dcmonjmm. llpponit Cl. C¢Mnw, ad Planetam in Ellipfi moventem extendi ab urroque foco duas rectas, quarum al linca. Conliructio porro talis efi 5 Pig. IL L c{%'Centrum Concenrrici A B C D E. B L D ePc Diameter. B A, B C, BP, fun: interval la apparentia. D E, D F, D Og funt interval la mediorum moruum- B E, B F, B Q; item D A, DC, DP, funt line: recte-BE Gt medii, a1tera aurem v/sri motfrs R H G eil linea rect. T B Ic{l: perpendicular is ad R H G. B I efi Centrum Ellipseos. l L I efk Excenrriciras. I O:: LI. O eil focus, circa quem ordinatur medius motus; L, circa quem verus. I M: I N: L B. BE fecal: D A in!-I;BF fecat DC in * M eii Apogéon;N, Perigeon; BLM G; B Qfecat D P in R. i Anomalia vera. Demon /Iratio. L .lilullrifiimus ac Reverendifi. Sethu: Wade:, quondam inCeleberr. Acad.0»;on; Professor A{'cronomia: Savilianus, nunc Epifcopus Sarisburiew-Hs, in Examine Affronominz P/ailoldicgedito Oxon. A. 165; . c. 6. docuit Methodum, 'ex data Anomalia media Planetarum, inveliigandi 1/cram; qua eii hujufmodi: Fig. III, C, eft Centrum Ellipfcos AEP: F, focus, cim quem ordinatur motus. S, focus, circa quem ordinarur verus moms. A, Apogéon, Perigeon, E, Erro five Planeta. APE, Anomalia media. ASE, Anomalimvera. PET, linea reéra, E T -1: S E. ST efi linea recta. In 13.0 S P T danrur, 1: S F diH:amin focorumz 2. P T: - F E'~}- E S
- A P. 3. A F T, anguius externus, five Anomalia media, acqualis Exmnvac
zmgulorum F ST & T. Ergo inveniri potefl FS B, five Anomalia vera,
aequalis differentiate Angulotum F ST & T. Nimitum