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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)
# Folio 101, page id 820424455:0123
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scd. 2
ASTRONOMTA
Der cas tius altii iocu teniper etane ad toitoe 
Declim quata relus; cac  io catatua veatusa
centro rerrae ad supeticnnt, coreu vilam hulorem ap
paricuram, ex Opticis norum est.
ribus. Commune esc auce ous pucanous, quele
P
Lotala
De Refractionibus.
PAcuram Refractionum qui desiderat quodammodo in-
celligere, is in Fundo pelvis calculum ponac, capurque
tirmet cerro in sieu, ita ue labium pelvis obster, ne calculum
videar. Tum jubeat infundi aquam ad Cummum ulque;
experietur calculum, qui prius erar invisus, nunc in oculum
incurrere, criam (i nec calculus, nec oculus loco dimoreatur
usquam. Nimirum, qui radius directus à calculo prius por-
rivebatur ad Fronrem, ita retrinsitur cranseundo ex aquà in
aerem, uc allabatur oculo, calculumque ipsi visibilem Fa-
ciac. Ex hoc experimento duo colligere licer; primum eAt,
quod transitus radii per duplex medium, v. gr. ex aqua in
aerem, vel contra, pariat retractionem; alcerum, quod
radii exeuntes e medio densiori, veluri aqua, in rarius, qua-
lis est aer, retractione Fact a diversane a perpendiculari inci-
denre in superticiem urriusque medii terminantem; de vi-
ciltim, dum ex rariori medio incidune in densius, annuane
ad dictam perpendicularem. Ieaque s aemosphaeram Terrae
concipiamus tigurxe, sicuri est revera, globolx, cujus cen-
trum GIE ideM CUM CEHETOTerEX; Donamulque Solem in HO-
rizonce; perspicuum est, quod isti parri armosphxra, quae
capicibus nostris imminer, maxime oblique allabancur radii,
quippe Rringenres illam eodem modo, quo superticiem rerra
pedibus nostris subjectam. Ec cum radii Solis e purissimo
ac renuissimo aethere ingrediantur in aerem rapidura, atque
2
TX0