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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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dect. 3
ASTRONOMLA.
89
SECTIO ITH
Ostendens, quo pacto singula linea ex anguli
ex observationibus definiantur.
PROBLEMA I.
invenire lineam Meridianam.
N plano larisato ex ad Florizonrem xquilibraco Frmi-
terque Exo ducantur ex eodem cenero quamplures cir-
culi, _ in centro fgatur perpendicularirer lignum al-
citudine erium circirer digitorum, sustinens in apice la-
minam orichaleicam, per cujus minurulum Foramen Radius
Solis rranseat. Ac tum ancemeridiano tempore observetur
accuraté, punctoque nocetur incidentia radii Solaris in ductos
circulos, quorquor assequi radius porest: itemque tempore
Domeridiano obserrecur radiorum Solarium reditus ad eoldem
ordine circulos. Ouo facto si linguli arcus respondentibus
binis punctis intercepei Geomerrice bilecentur, linea bi-
sectris est meridiana.
PROBLEMA II.
invenire elevationem poli.
Iquadrane (hach Capaci e aftabre elaborato) super linea
meridiana prxcise tixo obserretur Aellae alicujus polo
eleraco