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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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2
ASTRONOMTA.
Lib. L.
Quaritur Ano. P numeratae à media nocte octendune ini-
converiendus in cium crepusculi maturini.
hOraS, quae Dlubrractae a 12 horis, oAendunt finem
e
crepulculi resperrini.
Exemplum. Cum Sol est in 27.905 dC, Londini ini
cium crepusculi maturini incidit in horam 4, 5 4. Vespertini
autem tinis in 7 hor. 544.
DROBLEMA VII.
Data Flevatione poli, nec non Alticudine sideris, cujus simul
Declinario es Ascensio recta nota sit; temporis momentum,
 sideris Aximuthum invenire.
Sol Meridie culminat. Hujus Ascensionem rectam auset
ab Ascensione rectâ Bella. Reliduum convertum in Horas
octendic, quor horis post meridiem Aella culminet.
Ouando isirur lidus est in plas
in Triangulo PZ S
SOrientali, Fig. XV. L
Occidencali, Fig. XVI. 3
F. PZ. Distancia polorum AEquaroris _ IlorizOnSi
dantur Londim se
2. E. SCope ecuus data lideris.
3. PSC omplementum Declinationis datxe Cideris.