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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 281, page id 1040780814:0299
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_E GTEOMETRLOE F LEMENFA.
d
Terra ad Distantiam Solis ab cadem: Innotescit isitur ratio inter
Dittantias Fixa et Solis à Ferra; ac proinde ipsa Distantia Fixa d
Terra nota CA.
SCFEOL TVM.
In praedictum usum commode altumentur Jupiter in situ AChro
nrchio e Stella Sirii, qua (si alia quaeris) Soli aequiparari poterit.
Cum autem Jupiter in dicto sicu splendore Sirium Tuperet, et prae-
terea radii Solares in Torem incidentes non sine debilitatione in
Terram reftectantur, sed plurimi ad Poris superticiem suftocentur;
Victantia Sirii hoc modo definita minor erit verd.
PROPOSETIO LXI
Tellae Fia Distantiam aliter aestimare.
Cum Fixx etiam Splendidisima Diameter nequeat per Tubum
Opticum ullum hactonus fabricatum cousque ampliari, ue sensibilis
cradat e cum Solis Diametro conferatur; Paltem Solis Diameter
Cousque minuatur, ut illius sic minutae lumen (senluum judicio)
non tut majus lumine Sirii noctu scintillantis, quod Aet E in Tu-
Dum ejus radii admittantur per foramen satis parrum; vel sI ejus
imaso ope Lentis cousque minuatur, vel partim hoc modo partim
illo: Tmaginis enim Solis sic minuta Diameter licet insensibilis, (s
immediate aspiciatur,) ex datis Foraminis DiaeTTO, LenLC _ Situ
oculi, calculo Optica et Dioptrica Cuperstrueto innotescit. AEqui
Solis imasinis, oculo positione dato aquilucida atque Sirius, aequa-
lis est Diameter Sirii Diametro; innorescit igitur per calculum Sirii
Diameter apparens prius insensibilis: Scd Sol et Sirius aquales po.
nuntur; corumque proinde Diametri aquales: exitque ideo Distan-
tia Sirii ad Distantiam Solis ut sinus Diametri apparentis Solis ad
sinum Diametri apparentis Sirii, sive (ob parritatem horum ansulo-
rum) ut Diameter Solis apparens ad apparentem Sirii Diametrum;
notaque proinde erit Sirii Distantia. O. F. I.
TIb. III.
ISTRONOMIA