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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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Lib.
AASTRONOMIA.
In Triangulo R AO vel RDO
dantur pEX
FT. Angulus Orientis puncti A vel Occidenii
ter rectum
ad R
puncti D acquisirus iste in Trianoulo vO
Avelu Or a, licuc in Problemare IV, hic
in FrianguloYOcD, vel  OC D, ut in V
2. AO vel DO arcus inter L ongitudinem S0
L
lis ex Alcendens Descendensre punctum L
lIDEICR INCETCCPEUS.
Quaritur RO arcuS, qui li major vel aqualis est are
vilionis darx sella, consxicicur urique; Cin minor,
Radiis Solaribus delirescit.
Noca. Quandoque angulus Orientis minor est arcur
honis, alque tum si vel media nox Forer, Stella neuriqual
conspiceretur: Ouod (i vero luberahas arcum vilionis à d
prectione Eequatoris sub orizonrem maximâ (quae con
plementum est Elerarionis poli nobis Londini degenribu
38.47) relinquirur Declinacio borea gradus Feliprica
quem oportet Solem assecurum, ut vel media nocte demal
incipiar Rella comparere.
T. gc. Scellae omnes quintae magnicudinis habent arcut
vitionis 26; auter igitur 16 Cx 38. 47 deprectione A qu
toris, restane 22. 47 declinatio Solis borea, quanta requ
ricur scilicet, ut ipse vel media nocte 10 gradibus depi
matur intra Horizontem, quo sellx quinex magnicudi
appareane. Aequi cantam declinationem Sol haber in 13. 44
XE, _ in 16.5650. Dum isitur SOl peraERAE arCUM LC
lipciex a 13. 44 S ulque ad 26, 56 eo, RellX quinrx magn
cudinis L. ondini nec media nocte conspiciuntur, impediente
crepusculo.
PROELEMA VI
Datà Flevatione poli es Longitudine Solis; initium cit
posenli matutini, es finem vesportini invenire.
In hoc e sequeni Problemate datux Citus Solis respecti
Equaroris e Horizonris, e quaerirur licus ejus respest
Meridiani.
du