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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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Cap. 4.
LASTRONOMTA.
Rexylas Prisonomerrix inculeare. Praererea ordinem in
sequentibus problemaris oblerrabimus qualem circulis qua-
cuor principalibus supra dedimus; ica quidem, uc licum
cujusque puncti respectu Equaroris primum exploremus,
deinde respectu Fcliprica, cum Horizoncis de Meridiani,
quam porro distanciam habeane ab invicem, e quomodo
ad circulos politionum reterantur. Sed e in singulis octen-
demus modum problemata inverrendi, ut quae prius crant
data, mox tianc quaelira e vicissim. Neverolonsi limus
deinceps in explicatione Schematum, placuir quodvis Spharx
punctum, circulumre iisdem ubique noris insignire, quod
etiam Lectoris phancalix ac memorixe paricer adjumencum
laris oporrurum adteret. Inrellisatur igitur ubioue
P POluS.
A 9 AQuatOr.
PP Circulus declinationis.
F Polus Eclipricx.
FC Fcliprica.
F F Circulus lacicudinis.
N Incersectio verna.
un Incerlectio aucumnalis.
A Ascendens 2 punctum FC.
DDescendensS diptica.
LLenith.
NTNadir.
HO Horizon.
Z N Verricalis.
Or Orientis 2B Spolus
Oc Occidentis s ∞ Q merid.
Circulo inceero, Meridianus.
R Rectus angulUS.
OSol.
SSidus, Sol vel Rella.
bborealis 2 laricudo, declina-
m merid. Scio, vel ampliruda.
P ROBL B M A 1.
Data Longirudine Solis (vel alterius sideris in F. olipriea sii 3)
Declinationem ejusdem, es Ascensionem rectam, nec non
anculum Fclipticae  Mecidiani invenire.
15
In hoc Problemare datur Sicus Cideris respectu Fcliprica, e
quaericur sicus ejus respectu Equatoris.
Fig. P. vel II. elise quadrancem, in quo sol verlatur, qui
in ficura insinitur aliquo numerorum 1, 2, 3, vel 4, eAque
Pr.