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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 320, page id 1040780814:0338
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320
Ascentio recla, e conseguenter Ascentio recta Punteu  oo
nempe centri Ombrae; hoc est, rD: Dabitur isitur ACcentionis vera
vD e apparentis re difterentia BD, sire (quem arcus hic mensurat)
angulus BPD. In triansulo sphaerico a PZ dantur tria latera; nempe
Pz complementum Altitudinis Poli, 2 a complementum obserratae
Altitudinis apparentis Lunx, ec ae complementum observata De.
clinationis Lunx apparentis; dabitur erso Z. a P ansulus. RurTUS, iM
triangulo var dantur duo ansuli modo inventi r AP _ VP a, cum
latere intercepto aP; invenictur isitur latus a V, Lunx Parallaxis;
dud data, invenietur per ProP. XL. VI. L.ib. II. quaesita Luna Distantia
a CentrO PerTA.
PROPOSETTO LKLLI.
Unae Distantiam a centro Terrae, ado mrC, per observatio
 Inem determinare.
Delisnet ou Terram, cujus centrum r; 0 locum Oblerratolto.
Sitque 1. Luna in priore obserratione, quando iptius Dictantia cam
a Terra centro quam ab Obser-
ratoris oculo (nempe rectae FL,
OL) per pracedentem determi
nata sunt; e immediate ante
vel post Defectum Luna ictum
quo obserratio dicta facta fuit,
obserretur T una in L diameter
apparens. sit jam Luna in alio
quoris Orbita lua loco, ut ad 1:
quaritur rY ejus Diltantia a Yel.
Juris centro. Obserretur Luna in 2 dialeuet apparens; eAtque
(ut vulso notum) oY ad or ut apparens diameter Lunx in L. ad
ejuldem diametrum apparentem dum cst in L; hoc cA, in ratione
data; datur erso ipsa Ol: Sed per Altitudinem apparentem Luna
in 2 datur angulus V0r; in triangulo isitur 10r datis lateribus
Ol,or cum angulo 20r, invenietur XY Distantia Lunx à Terra
centro. 9. F. F.
Non eut Opus uc dial appasentes l cicut pallioo Plati
exprimantus, sume s harum ratio ad inricem obserratione inno
telcat: Nam arcus hi aut anguli non comparantur cum aliis an
sulis aut arcubus per circuli partes expressis, sed tantum inter sc;
horum enim ratio inversa est ratio Distantiarum Lunx ab oculo
temporibus obserrationum. Saris isitur MM h illa Mierometro
Lelescopio aptato obterrentur, et tlorum Distantix, in aquales
parces dirisa e per illarum numerum expresta, HOTEnEUT.
Lib. IV.
ASTRONOMLA PAFSTCE
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