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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 359, page id 1040780814:0377
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L. 1D. CF.
umbrd usco censcus quodam tenpors punel c ut suunt
celebranda cum illud ad  Pettt. Supaus Coiclratorem
intra hunc circulum constitutum, uc au O. lire polius in Hemi-
Ephaerica superficiei illuminata puncio, suol ecta ex o ad planum
Disci normalis octendit; inrenienda cst quanta Diametri Solaris
parS d Luna LeSatUE pFX.
dicto Observatori. Fun-
satur recta A0,  produ.
catur doncc circulo MOX
occurrat in M; dico Solis
Diametri partem à Luna
tectam ese ad Diametrum
intesram ut OM ad AM.
lam si Obserrator esset in M, Luna nullam prorsus Diametri So-
laris partem ab illo teseret: Obserratori rero paulatim versus Pen-
umbra centrum a prosredienti. Solaris Diametri pars maior major-
que per interpositam Lunam ab illo tesitur, donce tandem illo ad
centrum a perrento, Sol totus (hoc cH, ejus Diameter integra) ab c0
tesatur, si modo Solis apparens Diameter Luna Diametrum appa-
rentem non excedat, (quod hic suppono, quodque in harum magni-
cudinibus medioeribus tere obtinet,) e Luna totalis Vmbra vertex
ad Terram usque pertingat, siro circulus penum brOsIS MO X Cen-
trum habeat perfecte ex totaliter umbrosum: Ft ideo A Solis Di
ameter ut AS in Uncias diridatur, ex data ratione inter A M _E OM,
qua ex Loci intra circulum ma x situ dato innotescit, dabuntur Dia-
metri Solis Oncix sire Disiti obscurati horumque partes respectu
Obervatoris.
Ouod h circulo m xa concentricus sit (ut in Ag. Separata) circellus
BC rel totaliter umbrosus, vel non mere umbrolis, sed reliquo ob.
scurior e quidem aequaliter; hoc es, si Ombrae Lunaris centrum
vel ultra Spectatorem procendatur, vel cirra illum delinat, l0c0
rectae as sumenda es in priori calu recta BM Semidiametro.
rum AM _ AB differentia; in posteriori en illarum summa: est
nempe Solis Diameter interra 2d ejus partem Spectatori ad o a Luna
tectam in casu priori uE BM ad OM, in posteriori verO ut CM ad
OM. Nam in priori casu Spectator ad B Solem integrum ridebit a
Luna tectum, in posteriori Spectator in a politus circa obscuram
Lunam circulum e Solari Disco reliduum lucidum videbit, corona
instai, cujus visa Latitudo aequatur Semidiametro Solari minuIae SC.
midiametro Lunari, eidem nempe cum Semidiametro AD e Luna
rila; oportetque ut Spectator in e consticuatur, ut Luna mareinem
Solis Discum interius continsentem cernat. Determinata isitur cA
in omni casu Feliplis Solaris Ouancitas. G. L. F.
PRC
_E GTEOMLXRKCA F L EMENTA.
centrum pervenerit, sic Novilunium verum. Ponatur a ese Pen
per rectam les instituit, ipsumque circulum venumbrosum esse
MOX; erit a N itineris Penumbrae pars ea qua facienda cA in-
ter hocce temporis punctum ee momentum Conjunctionis verx