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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 485, page id 1040780814:0503
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LIB. VI.
_E GEOMETRLCA PLEMENTA.
485
lis motum explicandum) superinducet Fpicrclum, Solemque in
hoc ponet diei sux spatio circumrotari, dum interim P picreli cen
crum in Fxcentrico motu annuo desertur: Sic enim hiet ut Solis
inaqualitas diurna ab Astronomo Lunari obserrata explicetur, II.
dum incola Lunari qui Terra directe subjicitur nox est, Solem in
inferiori Fpicreli parte, ec dum eidem dies est, in superiori verlari
Donat. Sic Rxcentrico Martis circa Terram disposito ejusque Ppi-
erclo à Terricola excositatis, quibus Martis motus e quiescente
Tellure apparens explicatur, superinducet Lunaris noster alterum
Epicyclum in prioris Ppiey eli circumterentia delatum, spatio Nych.
chemeri a Marte percurrendum. P.Aque hic modus unicus, quo
Astronomiam Cuam condere possit motiis sux sedis ignarus e ii
lius quietis vindex: nempe circulum à se luoque domicilio revera
percursum in Calum, inverso situ, transterendo, motumque in eo
pari tempore tactum supponendo; _ quidem rerd ejus magnitu.
dine retenta, s distantia vera innoteseat: si autem hac lateat (d
nulla supertunt media, quibus in hac quiescentis Lunx hypothesi
dignosei pOsTIE) tanta saltem magnitudinis ponitur Ppicrclus, ut
ex Obserratoris loco aequalis magnicudinis videatur, ac ex cadem
distantia videretur ejusdem loci vera Orbita. Sin Incola hemi-
sphaerii Luna, cui Terra imminet, motus sui domicilii circa
Ferram Terraeque circa Solem gnarus ponatur, ex obserrationes
instituere possit aque accuratas ac qua a Terricolis tiunt; po-
terit hic Solis, Planetarum que Syctematis Solaris, Magnitudines
e Distantias mutuas cum Tuarum rerum magnitudinibus d di
stantiis exacte Patis comparare. Nam sux sedis Diametrum me-
tiri pocerit, similiter atque nos Telluris nottra. POrro, FOtIu.
ris Distantiam facile cum Luna Diametro comparabit; nam
Funx Diameter subtendit angulum satis sensibilem ad Tellurem
nempe gradus semisse exprectum: Atque Diametrum Orbis sui
circa Terram tanquam scalam adhibebit, qua religuorum corpo.
rum mundanorum Distantias exquirat. Ilaec enim subtendit an
culum ad Solem gradis triente expressum, positd parallaxi Solis d
Terra visi sO tantum; qui vero ad Martem Soli oppolitum ad gra-
dis fere bessem ascendit, et ad Venerem Soli conjunctam de retro.
sradam sesquiquintum gradum excedit. Porro, Lunicola iisdem
modis exquiret rationes inter Planetarum primariorum Distantias
a Sole, quibus Perricola; notis vero Diltantiis, ex Planetarum
Diametris apparentibus illorum Magnitudines cruet.
PROPOSTTIO IX.
Raecipua Felturis Phaenomena Oculo in Luna collocato visa
describere.
In Luna duo sunt FTemispharia omnino diverta, immo contral las
respectu Phanomenon, de quibus Propotitione hac asitur. In a1.
tero enim Luna Fremisphario Terram perpetuo vident, in altero
nunquam; nisi quod proxe horum limites tractus sit, cujus incolis
Terra