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# Title: Nicolai Mercatoris Holsati, è Soc. Reg. Institutionum Astronomicarum Libri Duo, De Motu Astrorum Communi & Proprio, Secundum Hypotheses Veterum & Recentiorum præcipuas; Deqve Hypotheseon ex observatis constructione (shelfmark Leibn. Marg. 63)
# Folio 100, page id 820424455:0122
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X
ASTRONOMTA.
A CemIrum TerrX; CBD superticies ejus; B oculU ;
E FC verricalis in Firmamenro; Actrum vero (It inprimis
in Horizonre vilibili BK in puncto HI; per hoc isitur pun-
ctum H a centrocerrae A edusta recta A H l oftendit in Fir-
mamento punctum I, qui proinde est verus AAri lOcuS. RuT
Tus per altrum EI ex oculo B continuara recta oftendic in Fir
mamenro visum astri locum K. Ergo parallaxis eAt IR.
Eleraro poltmodum actro ad L, Parallaxis exit M N; Siad
Opervenerit, parallaxis erit P (; I1 denique ad ipsum ver
licem R, parallaxis nulla erir omnino, nam linex a centro L
_ oculo B per actrum R eductx impingune am bxe in ipsum
verricem E. Cum enim in Eorizonre parallaxis (ic maximdi
Turgente exin magis ac magis lidere, aerenuatur, donec II
ipso verrice evanelcat. Prxrerea memorabile est, quo all
quod altrum suerit cerrae vicinius, eo ipsum majori parallas
aftici. Nam actrum v. gr. in S, in eadem viluali line a cum
H consticurum, Corricur parallaxin TR, majorem urique,
quam Fuerac lK parallaxis actri HI. Idem quoque Sidusd
li eleretur ad V, ubi consistat in eadem riluali linea cum L
habebic parallaxin NX, majorem, quam (IE M N paral
laxis lideris L. Denique in P polirum actrum in eadem linea
viluali cum O, parallaxi afficitur L, eriamnum majori.
quam sic OP parallaxis lideris O. Caererum mensura arcul
Parallatrici v. gr. IR cA ansulus IHR, vel huic ad verH
cem oppolicus AHI B, quem linex veri e visi loci Planela
efficiune in ipsius Centro H, C cui Pemidiameter terra AL
subrendirur. Hic enim AFI B angulus est differentia ansu
lorum FBHI _ F AH, quorum iste distantiam sideris
verrice vilam, hic veram extibet. SunEVeTO PEXTeF AlEII
dinis parallares in verricali circulo acceptas, dux eriamnurt
alixe parallaxeos species, lonsicudinis scilicet e lacicudinis;
quarum ilta quidem est arcus Celipricae interceptus inrer duos
circulos lacitudinis per verum ec vilum actri locum rrajectos;
hic vero est arcus circuli lacicudinis cujulvis interceptus intet
duos Fclipriea parallelos per visum dc verum altri locun
cranleunres. Etorum ulus praecipuus est in Eclipsibus Sola
ribs
Lib. I