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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 43, page id 1040780814:0061
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A quitde
implius
um, tC
Cum 18
quam a
aequabili
Solcimm
Terra in
I; ut nem
EnEIUIL aC
CenB
es Lullem
erC; COr
ludunt:
heoria
tur Orbi
pendar.
deiNque
liS COn
15 Lemot
Oralis
iiidem
rectad
US anE
Joc ellu
(IVCrOV
discest
BQA
LD. I.
El AEDMETRICA E. LEME H Fd.
cextam inter lineam Apsidum sa, c lincam S L (obleiral
Snitam) a Sole ad Planetam protensam: Planc aurem esse condirio
nem motus Planeta cujulris circa Solem, Patet ex Propositione XIII.
Praterea locus Felluris in Orbita Flliprica ejusmodi ekt, ut aliorum
circumcirca Planctarum loca in fuis Orbitis F llipricis respectiris in
renta, e Tellure rila, obserratis in Coelolocis exacte consruant; quod
in alia quaris Orbita non aeque Feliciter contingit. Cum isitur Pla-
netarum loca, per calculum ad Orbes Flliptieos accommodatum
inrenta, locis obserratis optime consentiant; ad alterius rero H.
surx Orbes neutiquam, nisi quatenus alix illa ad F. Ilipticas praedi.
ctas accedunt; constat Orbitas Fillipticas a Planetis revera deleribi.
Planetarum primariorum Orbita Fllipticae, circa Solem in com
muni Ombilico descriptae immota fere CnE; hoc eA, CUM PIa-
neta ad Orbitarum Cuarum Apsides, aliare qua ris data puncta, per-
venerint, ad eadem proxime Spatii Mundani puncta redeunt: Nam-
Ide sla a VCeratis C Telture Planctarum locis inter P’ixas Patis-
PROPOSITTOXXXV.
Vilibet Conaru ndetur in dectione Conica, cujus Sinou caita
taciunt.
alter Est 301.
Lales namque Orbitae cussue sora obsetratis coetarum locis
omnibus conreunt. Verum quidem est Keplerum, aune seguu
eos Philosophosnon paucos, Cometarum Frajectorias potuise Rectas
lineas; ex inde Cometarum quorundam loca obserratis latis con
srua calculo lubduxilie. Atque hoc Heri poterit, licet Cometa in SC
ctione Conica feratur, si observetur tantum in Orbita sux parte
qua a Recta non mulcum abludit. Sit a Pr BC Coni Sectio valde
excentrica; hoc est, in qua Distancia Focorum ejus Axi trantverso
est fere aequalis: hujus Focus alter PIE S SO-
lis centrum. Pieri potest ut Cometa obser.- a
vecur, dum Orbita TUa paFECM A P PCrCUF
rit; ex cempore reliquo, dum a P Per V, B ad
C transit, (ubi in resiones longinquas abi-
ens visii se Subducie,) sub radiis Solaribus
delitescat, respectu obserratoris in Tellure
circa Solem S mota: Vel Heri potest ut
Cometa percurrens A P V B SUB Solis ra-
diis abscondatur, (situ _ mocu Telluris C
ita Ferentibus,) ex tunc demum obserretur, cum ad B perrenerit
Tineam B C deseripturus; ex in utroque casu Semita Cometx d recta
non disferet sensibiliter. In priore casu Cometa a Sole absorberi vi
debuntur; quippe tunc risi dum ad Solem appropinquarent; pollea
vero consrectum fusientes, ac proinde pro destructis habiti: in
posteriore e Sole oriri; nempe primum riti cum ab illo in resiones
longinguas alcenderent. Porro, cum Cometa in Tuo vertus Solem
descentu (ut in a ∞) obserratur, ad Solem pollea appropinquans, et