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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 186, page id 1040780814:0204
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186
ASTRONOMLE PAESTCF
Laticudinis circulum refertur: similiterque Lonsitudo Sola quan.
doque afficitur, immutat a L atitudine; nempe quando Phaenomenon
CM in Feliptica per Zenith transcunte. F. X quibus constat Phaeno.
meni ad orientem ab Feliptica sradu nonasetimo positi Lonsitudi-
nem per Parallaxin auseri, quia adhuc masis in orientem ab hac
causa promoretur; inde ad occidentem rero potiri Lonsitudinem
minui: unde praecer alium ominem motum Phaenomeno compe
tentem, ex Parallaxi moveri videbitur, quoniam ob mutatam Par-
allaxin ejus locus risus mutatur. Atque motus hic, qui non ve
rus eM sed vitus, Parallaxis Motus a quibuldam dicitur. Ouaque
de Phaenomeno respectu Feliptica ejusque Sccundariorum, de c0.
dem ad Aiquatorem relato limilirer sunt intellisenda.
EROPOSTTIO XLVI
tantia Phaenomeni à centro Terrae est ad semidiametrum
Terrae, ut sinus distantiae apparentis à vertice ad sinum
Parallaais.
Sit F centrum Perra; locus in ejus superticie L, cujus Zenich 2.
FTOriZON TE; Sitque Phanomenon in P. FA.
que (ex notistima triansuli rectilinei proprie
tatc) rP ad rL. sicut tinus anguli T Le (sire hu-
jus complementi ad duos rectos Z L. P) ad sinum
anguli PPL; hoc est, distantia Phaenomeni a
centro Terra ad semidiametrum Terra FicuL
sinus distantia apparentis à vertice ad tinur
Parallaxis. 9. F. D.
Hinc datd Parallaxi datae altitudini competenti, dabitur distantia
Phanomeni à centro Terrae, ec rieistim.
PROPOSITIO ZIVII
mus distantiarum apparentium Phaenomeni à verrice sunt sieul
Sinus Parallaxium.
Ftenim (Per PFOP. PrXC.) sinus distantix apparentis à vertice cAt
ad sinum Parallaxis ut distantia Phaenomeni à centro Terrae ad se
midiametrum Terra; hoc cA (in eodem Phanomeno) in ratione
constanti. Ouare ut sinus distantixe apparentis à vertice in prima
obserratione ad sinum distantia apparentis à vertice in obterrati
one quaris alia ita sinus Parallaxis in obserratione prima ad finum
Parallaxis in secunda obserratione. O. B. D.
EROPOSTTTO ZLVMI
Vorum Phaenomenon inaequaliter à Terrae centro remotorum,
quorum aequalis est distantia apparens à vertice, Parallaves
sunt reciproce n distantiae à centro l’errae.
Reliquis ut prius designatis, sint duo Phaenomena e et P in X
quali
II.