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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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1
la
Cap. 3.
AASTEONOMTA
Boraria. Conslarum ex toris; minuris se secundis
a meridie compurarum ostendic iptum momentum culmi-
nationis.
Probl. 9. Datotoco Solis, vel fixe cuiusvis; ascensionem
ojns, es descensionem oblignam, nec non amplicudinem orri-
vam es occiduam invenire. Datum locum solis, vel fxx,
adjunse Horixonri orriro, ee noca gradum Rquacoris, qui
una alcendie, hic enini vocatur A(censio obliqua Solis, vel
Rella. Tum a cardine Orienris; hoc est; ab interfectione
Equaroris ex Horizontis ad locum ulque Solis, vel BxX
arcus in Horizonce interceptus, est amplicudo sideris ortira.
Sin eundem locum Solis, vel stella, adjungas Horizonei
occiduo; erit gradus Eguatoris una descendens, Descensio
obliqua Solis; vel stellx. Fic a cardine Occidentis, hoc est,
ab incersectione altera Aquatoris e Eoriconcis ad sidus
ulque occidens, arcus in Hlorizontenumerarus, est ampli.
tudo Solis, vel stellae, occidua.
Probl. 20. Darâ Ascensione solis, vel fixa, recta pa
rirer acque obligua; dimidiatam eorum moram suyra vel
infra Florizontem, nec non concitudinem dici  noctis; bo-
nam item ortus et occasus Solis invenire. Dari Cideris Rlcen-
sionem rectam auter ab obligua vel obliguam a recta,
pronc haec rel illa major minorre exrirerir; quod rectat, est
differentia ascensionalis. Hlanc converres in cempus (quem
admodum supra Problemare 8. docuirus) quod declinante
Sdere versus poluri elevatrini, addicum sex horis, declinanre
aurem sidere versus polum depressum, derractum sex horis, ex-
tibet dimidiatam sideris moram supra Florizoritem; ae tujus
completriencum ad EZ horaS, eA dimidiara Cideris mora Intra
Hlorizonrem. Dimidiaca mora Solis supra HorizOntem (I
computerur a meridie; extabic hora Oceasus solis; ac di-
midiara mora Solis intra Horizontem compucaru a media
nocte, extriber tioram Orruis Solis. Porro dimidiara Solis mora
supra Hlorizoncem si duplicetur, extac longicndo diei; d simi
diarx morae intra Florizonrem duplum est lonsicudo noctis.
Quod li indicem horarium aptaveris horx duosccime, cum