Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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CHRIST. HUGENII
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ut illa propius ad eam accedat, ut cum ille eſt in N, hæc in
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F: </
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">vel cum diverſas partes reſpectu A C obtinent, velut cum
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Saturnus eſt in N, Tellus in f; </
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<
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xml:space
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">utroque caſu linea interſe-
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ctionis annuli atque orbitæ Saturni, ut hîc N Q, quæ ni-
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mirum ipſi A C æquidiſtans acta eſt, Terram Solemque ab
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eadem parte habebit. </
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<
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xml:space
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">Unde intelligitur, utrovis poſitu
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eandem annuli ſuperficiem à Sole & </
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<
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">nobis aſpici: </
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<
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xml:space
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quiri jam ſupra advertimus, ut brachia Saturni aut anſæ ap-
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parere poſſint. </
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<
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xml:space
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">Quanquam ne ſic quidem ſemper cernuntur,
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uti poſtea manifeſtum fiet.</
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<
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</
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<
s
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xml:space
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">Hi autem diverſi ſitus ut ex tabulis Aſtronomicis parvo
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xml:space
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">Saturnus
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quando ne-
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ceſſario ro-
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tundus ſpe-
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ctari debeat.</
note
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negotio cognoſcantur, indeque rotunda phaſis, quatenus
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ab hac cauſa pendet, prædici poſſit, ſciendum eſt, quan-
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docunque Saturni locus apparens locuſque ex Sole ſive ec-
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centricus, diverſas partes obtinent ejus loci quem inter fi-
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xas deſignat recta A C, (quam in gr. </
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<
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poſt hæc oſtendemus) id ejuſmodi ſitum Saturni ac Telluris
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indicare qualis in H & </
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<
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">D, ut nimirum ab eadem parte am-
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bo reperiantur rectæ A C, atque propior huic Saturnus con-
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ſiſtat; </
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<
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xml:space
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">eoque tunc rotundam phaſin conſpiciendam dari. </
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xml:space
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">Il-
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lo enim poſito, ſit Saturnus in H. </
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xml:space
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">Primùm itaque dico ab
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hac parte lineæ A C etiam Tellurem conſiſtere. </
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ad alteram partem ſita eſſe dicatur, velut in P; </
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ex P ad H ductam & </
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">verſus ſixas porro continuatam, quæ
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locum Saturni apparentem, itemque rectam L H, quæ pro-
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ducta locum ejus ex Sole demonſtrat, ab eadem parte pun-
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cti æquinoctiorum, quod L A producta inter fixas determi-
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nat, utraque ea loca exhibituras; </
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<
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xml:space
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">contra quàm poſitum fue-
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rat. </
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<
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">Eſt ergo Tellus neceſſario ab eadem parte lineæ A C,
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qua Saturnus H. </
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xml:space
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igitur D H ad fixas protracta locum Saturni apparentem de-
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ſignat, L H vero, uti diximus, locum ejus eccentricum,
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inter quæ loca intercedere ponitur locus æquinoctiorum quò
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tendit L A, neceſſe eſt rectam D H tandem ipſam L A in-
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terſecare, ideoque punctum D, locum videlicet Telluris,
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amplius diſtare à linea A C quam punctum H in quo </
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