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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. a.
ASTRONOMT
FLIT. Cataloens inseniorum Fixarum.
L. V. Tabula Declinationum, es Anculorum F Cliptice
ex Meridiani.
LL. VI. Tabula Ascensionum Rectarum.
L. VTI. Cataloeus illustrium locorum ab Uranibures
Meridianos, es ab SEguatore Latitudinem ex
hibens.
Sequitur Usus Tabularum, praeceptis e ex
emplis praemonstratus.
PROBLEMA I.
Tempus Ulsuale convertere in Astronomicum.
T rempus usuale aptum reddatur ad ingressum in Tabu-
Lla5 criplici opus correctione.
2. Dies currens remporis ulualis incidit vel in annum
bissextilem post Februarium complecum, vel in tempus
quodvis aliud. Priori calu, CI horX datx (inE antemeri-
dianx, uniras derrahatur numero dierum dato: Cin horx
line pomeridianx, nihil decrahatur; e habebis diem AArO-
nomicum complecum. Posteriori casu, (i horx sine anremeridia-
lie, Dinarius decrahatur numero dierum daro; (in pomeridiana
inchorx, unicas derrahatur; e rurtus habebis diem AAronomi-
cum completum. Hora vero pomeridiana quidem manent, uE
eranr datx; at anremeridianis semper duodenarius adjicitur;
 adjectis scrupulis horariis, ur erant data, exrabir cempus
AAronomicum. Nam in annis _ Mensibus nihil mutane Pab.
Iehonianae; led quemadmodum illi semper dantur currentes,
iea quoque non alios quam currences extribene Tabula. Sed
Rudolphinae concinnarae Purc ad annos de menses completos,
x iltos quidem Periodi Julianx; quapropter anno currenri
Oblaco