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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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dect. 3.
AASTRONOMCA.
dux AX_ A _ B, _ Planeta S. FC Fcliprica, d ejus
PoliE, F. T. In FriangulOF A B dantuEF A _ F B com-
plemenca laritudinis fixarum datx, e A F B differencia
longicudinis; invenitur AB _ F AB. 2. In Triangulo
ABS datur A B modoinventum, _ AS, B S ex obler-
latione; invenitur s aB. 2. In Priansulo S A F dantue
EA _C AS uc anre, _ angulus S A F componendus ex
noris S AB ex F AB; invenitur FS complementum la-
rudinis Planetae, _ A F 8 differencia lonsidinis RSX A
Cc8. Acqui longicudo fixx a supponitur data; erBo e
ongitudo S data exit.
DROBLEMA XVI.
Invenire aphelion e eccentricitatem Superiorum.
Ulando Planetae Superiores sunt in sicu acronvehio Soli
oppoluri, videntur nobis ex Tellure spectantibus in
eodem longicudinis gradu e minuro, quo ex Sole videren-
cur, E ibi oculus constirurus eset. Freo li circa id rempus
quoridie obserretur eorum longicudo, _ ad eadem obser-
vationum momenca suppuretur verus locus Solis; porest inde
concludi ipsum oppolicionis momencum, de ad hoc verus
locus Solis, cui cum verus Planetx locus e diamerro oppo-
nItur. Opus est autem eribus hujusmodi obserrarionibus
Aeronychiis in quolibet Planera, ut inde aphelion ejus 
eccentriciras innorescar. Nam redeundo ad Problema VI.
 Schema LXIII. dabuncur anguli ads, qua erune difte-
rentiae verorum locorum Solis vel Planera ad obserrationum
momenta; sed e ansuli ad f constitmentur a mocibus Pla-
necae mediis, quos inter duas obserrationes proxiias con-
tieir. Unde reperendo calculum ibidem indicalum colliges de
aphelion _ eccenrricirarem Planetae superioris.