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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)
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Sect. 3.
ASTRONOMTA.
in criansulo BsC. dantur L. sB primum a umT2; 2. sC
modo invenca, 3. BsC ex oblerrationibus; ergo invenie-
Tur SC sBC _ B C. Deinde in triangulo BfC ilosceli
quod fB, fC sine radii ejusdem circuli) daneur omnes
anguli, liguidem B fC notus est ex praecedentibus, _ re-
liqui fBC, fC. B simul sunc ejus complemencum ad 280gr.
ademque eguales inter se; datur vero ee latus B C nuper in-
ventum: Frgo invenietur fB. Denique in triangulo fs B
dancur r. sB primo omnium aNuMEa, 2. fB nuper inventa.
3. Angulus fBs, subducto nimirum sBC ex fBC:
quare inveniri possune de anguliienori, de latus fs distantia
focorum in parribus, qualium sB asumta erat r00000. Unde
inveniri porest eccentricitas in parribus, qualium distancia me-
dia Telluris à Sole supponitur 200000; dicendo: f B nuper
ivenca (eadem que aequalis ip(i de dinmetro maximx ellip(eo5)
dac fs itidem inventam nuper; ergo = a0, live dictantia media
Celturis a Sole suppolira 100000 parcium, dabit =F5 Cve
Eccentricitarem in parcibus similibus. Postremo Tubrrahes
FBs modoinvenrum, vel huic requalem b sB ex dato dsB,
ut restet d sb angulus, quo locus medix obserrarionis b di-
Itac ab aphelio d. Unde daro ex observarione loco b dacur
limul locus aphelii Telluris d. Modus hic inveniendi aphe.
lium ee eccentricitarem primum ab Ferisono propolicus,
deinde à Thoma Street hypocheli ellipriex applicatus (licet
hic circulum deseribat ex Sole, quem nos e superiori Loco
maluimus, ut coneruentia esset major cum lineis Schematis
LIX. adeoque minori conceptuum varietare minus Facisaretmr
Lector) modus hic, inquam, Ceometriee praestat uerum que
inhyporheli D. Wardi _ Ciomitis Pasani, neque delidera
cur aliud, quam uc ipla hypochelis masis consentiret cund
Colo. Quiare ue limitationis quoque Bullialai ratio habea-
Cur, opus est repetitâ operatione, qua per proximé acqui
ultam apogei sedem, e eccentricitarem invectisetur ano
malia media. vera ad cres observationes datas, quemadmo
dum Capire XXII. docui, ee per ictas anomalias medias.
peras corrisantur anguli ad f, puta afb, bfc, afc, Gus
nun