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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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Se. 3
ASTRONOMIA.
PROBLEMA VITI
Medium motum solis es annum tropicum definire.
Pus est duabus Obserrationibus quam lonsissimo cem-
porisinerrallo distancibus, quibus sol aequinoctii pun-
Ctum obcinebar; _ cum ex praecedentibus inmoruerir quoque
Eccentricitas e apogeon Solis ad urriusque obserrarionis,
arriquae (c. C modernx, tempus; non porest latere pro-
thaphaerelis Solis, quam cempore requinoctii habebat, unde
verus locus Solis porelt reduci ad medium in urraque obler-
Pacione. Deinde computandus est dx torus temporis tractus
inter urramque obserrarionem incercedens, e revolutiones
ulleorx cum prasibus, si qui int, excurrentibus, quas in-
cerea sol contecir. Unde per Regulam Proporrionum in-
eres: Si canto tempore (incercedente Ic. inter utram que ob-
ervarionem) Sol confecir cor revoluriones, e ror insuper
Sradus ac minuta; quanto tempore absolvet unum circuitum
nocu medio ab aequinoctio ad aequinoctium? etenim quod
Prodit est quanticas anni iropici medii. Ec cranspolicis
ejuldem analogix terminis, dices: Si lor revolutiones 
Fradus cum minacis, cedune tanro temporis intervallo (inter-
secto incer suas obserrationes) quor gradus es minura cedent
uni diei, vel horx 
PROBLLLL
Diametrum visibilem Solis ex Luna obset ute
 Deobe CPlaat  detoouI PEI
Pensiculorirer sux lamina, txec huie extremitari, illa
ps.