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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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ASTRONOMTA
Fitb. 10
lidus oritur vel occidir. Urriusque ascentionis, rectae vide-
licet _ obligua, differentia vocatur ascensionalis. Similiter
in Feliprica suppuramus longitmdinem ab inirio Arietis ad
punctum, quo circulus lacicudinis per datum (idus occurrie
Feliprica. Postea in hoc circulo lacirudinis numeratur inde
ab Fcliprica laritndo Cideris borea vel australis. Terrestris
in Equatore rerrestri supputamus longicudinem à primo Me-
ridiano ad punctum, quo alter Meridianus per darum lo-
cum occurrie Equatori. Poltea in hoc altero Meridiano
numeratur inde ab Fquatore lacicudo loci borea vel australis.
In Tlorizonce numeratur ampliendo ortira ec occidua inde a
cardine Orienris vel Occidentis ad Cidus ulque oriens vel
occidens, utraque borea vel australis. In verricali sumitur
alcicudo sideris supra, depressiove sub Llorizonrem.
Arquae hxe sunc detinitiones cerminorum, quibus urimur in
Doctrina Sphaerica; quibus exposicis, pergendum nunc
erat ad propolitiones, sive problemara, quorum graria
termini isti, sire appellaciones primum inventae fuerunes
verum in disceneium graciam inseremus hic nonnulla prius,
quae ad motus actrorum communis praecipuum phaenomerion,
tempus inquam, e variam ejus distributionem perrinent.
A
De Partibus Temporis.
Une isitur parres remporis praecipux, Dies, FTora,
Mlonsis. Annus.
Dies est vel Naturalis, vel Arrificialis. Nacuralis dies,
Craecis NoxBuuceor, eAt sparium 24 horarum, noctem pa-
rirer ac diem comprehendens. Arrificialis dies est spacium
temporis ab orru Solis ulque ad occalum. Dies Civilis et
astronomicus a Nacurali non dittert, nisi principio; pro
Ciri