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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. 3.
ASTRONOMPA.
Hiorixoncem, e dividitur in varios circulos, quorum
I
mus conriner duodecim signa caleltia, nominibus d cha-
racteribus suis distincta, ec in gradus cricenos distriburq.
Huic proxime jungiiur Ralendarium Julianum Pariter ac
Creoorianum, urrumque in menses e dies distriburum. In
extima ora extar circulus ventorum live plagarum mundi,
quemadmodum hodic a naucleris appellitantur.
4. Quadrans altimdinis, cujus mareo is, qui gradibus
distinguicur, applicandus Meridiani gradui nonagelimo
etrinque ab florizonce computando. Numerantur aurem in
cogradus ab Horizonte Cursum ad ipsum ulque verticem sivo
Lenich.
5. Circulus Forarius dirisus in bis (2 horas, quarum
22 meridiana Cursum versus Zenith, at 12 nocturna deor-
sum versus Horizoncem spectar; utraque verotaciei Meri
diani Orientali se pradibus distincta consruere debet, ita
uc Dolus indicem horarium seltans ip(UI CeMERU OCCUPCE,
acque ipse index mmoru diurno circumactus octendat horas in
Oxientali Pernicirculo antemeridianas, in occidentali pomen
ridianas.
6. Pyris nautica pedlamento impolica, cujus ope globus
ad mundi plasas dirigitur.
7. Semicirenlus positionis, cujus extremitares cardinibus
Meridiei ee Sepcentrionis aftigendae, ita ue ipse semicirculus
inde ab Hlorizonte ad Meridianum ulque libere ad quemris
Ticum elerari possir. Aeque haec quidem extra superticiem
urriusque globi visuntur.
Ac in ipsa superficie delineantur praeterea hi circuli:
T. Segminoctialis, in oradus 360 diritus, quorum nu-
merationis inicium est a sectione verna, Peu principio Arieris.
indeque concinuantur circumcirca, donec ad idem princi.
BIUM RevCrFANTuT.
2. Ecliprica divila in Signa 22. _ horum quodlibet
in gradus 30. Nomina ec series signorum memoria
tenenda:
Su