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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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ASTRONOMIA.
Zib. L.
In Letanato POS vel PHIS, proCiu stellae, Supero vel
infero
dantur
1. PO vel PH Eleratio poli Condini 5T. 53.
2. PSC omplementum Declinacionis lideris data.
3. AN. P, quem mensurat arcus quatoris inter
ceptus cruribus PO (PHI) _ PS; quorum
hoc Ascensionem rectam Cideris productum,
illud Medii vel Imi C aeli (Ascentionem rectam
oHtendit.
Onaritur Ang. O vel II.
 1
ete
ict.
Rurtus in Triangulo RP O vel RPH (diversi hemi
Ephaerii, quando nuper invencus O vel HI excedir quadrantem)
T. PO vel P H Elevario poli.
dantur PEXTeF ) 2. Ang. O vel H nuper invencus, vel (I 1
rectum adR) excedac quadrancem, complementum ejus
2d 180
Queritur R P Flevacio poli supra Forizonrem Rellae.
4. Coenirâ Eleratione, per Probl. III. Guaeratur, cum
Horizon axicur per Rellam SOrientalem, Ascensio 2 obli
EOccidentalem, Descentio 
qua cam Signiticatoris, quam Promistoris.
Signiticatoris directi
5. Inventa LPromissoris, ad quem Ascensio Descensio
Retrogradus dirigitur
ve- pro Hlorixonte Scellae, recta vel obliqua subrrahatur ex
alterius termini Ascensione vel Descentione simili (suffectis,
cum opuselt, 360) reliduum cA arcus Directionis quaesuusa
C ONVERSA.
Dato Significaroris cujastibet arcu Directionis; quo pervest
turus sic, indagare.
Supra directi Significatoris Florizonrem Elevatio polh
quaraTIT, ut ance; e ad eam Flevationem acquires pet
Problema certium ejusdem Sig. COriencalis, Ascentionem 
miACaTOTIS
Occidencalis, Descenlion. M S
obliguam