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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.
ASTRONOMTA.
obliquam; cui invencx addes arcum Directionis darum; ita
conslabis obliquam S Ascensionem,
Delcentionem.
cui per Probl
respondens gradus Felipricae (sed ad Elerarionem poli lupra
Horizonrem Significatoris COrPUTaTUS) est ipse lOcuS, ad
quem hoc (dato) arcu Directionis Signiticator perveniet.
Sed. Perrorradi Signiticaroris Ascensioni rectae derraties
arcum Directionis dacum, relinquitur gradus AAquatOris,
quem Sionificaror Rerrogradus offendit Directione provo-
lucus ad Promissorem. Per hunc eradum (diligenter no-
tandum) circulus Posirionis actus, erir Llorizon Promissoris.
lupea quem Flerario poliquaeratur, prortus uc ante. Nam
Geradus ille no. (Orientalem, declinan. Sboreum. Fis. Xxii.
cacus incidat in ce Signiticarore in Emerid. Fis. exiii 
plagam caesi) Occidentalem, decli-sboream, L. XXiv. C
lnance Significatore inZ merid. Fig. XXV. 1
in Triangulo POS vel PHIS pro Cua nocari gradus, supero
vel infero, ex datis ue supra (dum Angulus P’numeretur in
quatore, non ab AIC. recta Significatoris; sed a gradu
illo sxepius nocaro ad Medium vel lnum Coelum) quaritur
Ang. O vel HI; _ porro in altero Triangulo ipla R P Ble-
vario voli suora Hlorixontem Promistoris. Ad hane Eleva-
tionem acquires per Probl. III. Signiticaroris, I notatus ille
Bradus fuerit S Orientalis, Ascentionem
Occidencalis, Descensionem S
obliquam cui
invenex derrahes arcum Directionis darum; reliduum erie
obliqua S Ascentio
Descensio feni per Probl. Z Grespondens Bra-
dus Felipriex (sed ad Elerarionem poli supra EIOriZOnteM
Promistoris COMPUEAEUS) est ipse locus, ad quem hoC (datO)
arcu Directionis Sipnificaror perrenet.