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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.
ASTRONOMTA.
loci, quod vulgo dicitur Z enich. Huic igitur punctoMeri
diani quadrans alcirudinis affigatur cochleolâ lua, ita uE
mmaroo gradibus distinctus cum dicto puncto coniscet. De-
nique prxis naurica pedamento slobi imposica diriget acu
magnetica oculum operantis versus austri e sextentrionis
cardines, e manus circumducer Plorizonrem ligneum, donee
Meridianus aeneus ad paralletismum cum acu perreniat, e
Meridies Florizontis lignei respiciat verum Meridiem loci;
ita Aer, ue ex reliqui cardines globi cardinibus mundi con-
eruanc. Curandum est praeterea, ut planum, cui intstie
lobus, Horironei parallelum lic, adeoque Horiron ligneus
cum vero Horixonte loci consentiat.
Probl. 4. Gradum Solis, quem tenet in ectiptica, ope
Kalendarii, es adjuncti circuli sienorum, indacare
indeque locum ejus in ipsa scliptica assienare. Ouxre in
Horixonre lioneo mensem _x diem darum (obserrato Ralen-
cariorum, Tuliani ee Gregoriani, discrimine, ne alterum
Proalcero sequaris Derperam;) tum c regione diei inventi
in inimo circulo, qui est Bignorum, invenies gradum d
Sionum, in quo Sol isto die verlatur. Deinde in ecliprica,
qua superticiei globi inscribitur, quaere primum signt
modo exploratum, _ in isto siono gradum ipsum Solis.
ProbI. 5. Ascensionem rectam es declinarionem Solis;
vel stellae cnjusvis datae invenire; indeque indicem horarium
horae duodecimae aptare. Inventum per Problema praecedens
eradum Solis applica Meridiano, e nota gradum Aequi-
noctialis, qui Meridiano subjacet, is enim est AscensO
Recta Solis quaelita. Tum ab equinoctiali compura in
Meridiano ulque ad locum Solis in ccliprica, _ nutnerus
Praduum sic inveneus, est ipla Declinatio Solis, borea vel
australis, prour Sol ab Aquinoctiali recesserit versus polum
Arcticum vel Ancareticum. Dum vero locus Solis Meri-
diano adtarer, adjunge indicem horarium horx duo decima
meridianx.
Fodem modo Exx cujutris locum applicabis
Meridiano, e oradus squinoctialis culminans, eric iptius
Eixa Ascenlio Recta; ar distancia incer eandem fxam e
A q