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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 126, page id 1040780814:0144
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ASTRONOMLA PHYSIC A
Lib. I
120
Differentia gnonas elE ditterentia inter RIentionem rectam
e obliquam. Faceique de Descensione Oolguu Lurc Incellisenda.
In Sphard Parallela, UBI LIOLILOM H0 cum A quatoro RO coin
cidit, unumque ex motiis diurni parallelis constituit, illorum LOI
(nempe Lenith e Mundi Polus) etiam co-
incident: adeoque hac Sphaera positio
solis ad Dinos Terra Polos desentibus
competit; omniaque Calescia per motum
diurnum circulos Aiguatori parallelos
describentia, describent etiam circulosTIO
rixonti parallelos. Inde nullus erit per
motum hunc diurnum ortus aut occatus,
nullaque adeo in hac Sphaera AIcenSiODC.
scentiore, nullusque Meridianus, cum hic
per Polum locique verticem traducatur; cumque hi duo in hac Sphae-
ra coincidant, circulum nequeunt determinare, quolibet verticali
Meridiani nomen pari jure sibi vendicante. Solis vero phanomena
ex motu Terra annuo oriunda, in Sphaera parallela conspicua, Prop.
ZEXITT. LIb. P. explicata sunt; competentia nempe alterutrius Poli
incolis. In Syctemate rero apparenti patet Solem, dum ad illum
ab quatore Polum declinat qui Zenith occupat, perpetuo con-
Epici, lemeltremque diem constituere; sicut ex adverlo lemeltrem
ehse noctem, dum Sol ad alteras Aquatoris ac proinde FTorirontis
partes declinat; dicique ee noctis initia incidere in Solis ingrestus
in puncta quinoctialia.
PROPOSEPEO VIT
ddullo loci est arcus similis arcui elevationts Lod supra
LorLCM.
Sit acb9 Lelluo, Clsco Cerumt P, foI a aB, A. quator eg. Suma-
tur in hujus superticie locus quiris I, cujus Latitudo eAt LC arcus MC.
ridiani inter ipsum ee Aequatorem inter-
ceptus. Sit concentrica Sphara Caloctis, cu
jus Poli, sRquator, _ MeridianuS B, A, F. 9.
e BF AO relpondeant Polis, Aiquatori, e
Meridiano Terrestribus. Sit loci IZenith
2 _ NTadir n; nempe in recta rI produ.
eta intersectionibus cum superticie spha
rica Celesti. Ouare HO circulus in Sphae-
ra maximus super Dolos 2 d V deseriptus
eAt loci FToriron, e Meridiani arcus OB
ell Altitudo Poli conspicui e supra Horizontem, quem aio similem
elle arcui 2e, Latitudini nimirum loci. Nam quia a e B sunt Poli
circuli E. C, CA (per PrOp. X. Lib. I. Sphaeric. Pheod.) ans ulUS B FF
rectus; et ob eandem rationem ansulus 2 r0 est rectus. Si erso
ab xqualibus P xB, Z. x0 auteratur communis angulus ZFB, rC.
ligui