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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 102, page id 820424455:0124
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ABTRONOMIA.
ad aquae ideam versentem; retrinsentur rum maxime verlus
perpendicularem à Lenich nostro demistam; unde necesse ett,
radium sic retractum ad oculum nostrum, octendere illi 50.
lem altiorem, quam spectandus Foret, si ab (que atmosphaer
tuisset. Ouantitas autem retractionis Hlorizontalis licet a
Tychone paulo major detiniarur in Sole e Luna, quam in
Scellis; videtur eadem aëris crassicies eodem modo afficere
radios ab eadem caeli plaga allabentes, nihil morara, quan
cum cecheris sparium trajecerine, anrequam ad atmosptxeram
pertingant. Naca autem Fuerie icta differentia, quam SolIs
_ Scellarum retractionibus intexcedere antumabae Tpche,
ex parallaxi solis definita illi rrium minurorum, quae tame
vix quadranrem minuti explet. Ouanco enim deprimebat
Solem plus justo parallaxi nimia, tanto illum vicissim retra
ctionibus elerare cogebatur supra alias stellas paralluxi nula
attectas. Hinc est, quod Solis de Lunae retractionem HO
rixontalem Fecir 33 vel 3gminurorum, quam sellis tribuis
non majorem 30. Verius aurem videtur, Soli, Lunae, ac
omnibus sellis eandem refractionem Hlorizontalem com
Decere 30 qualiminutorum. Licer experientia plane celte
cur, pro vaporum densicare vel raritare criam refractiones
majores vel minores exictere, vel in eodem Horizonre; aique
ad boreale mundi lacus propter cractiorem aerem plerumque
increscere. Unde factum, uc Hollandis in Nora Z embla
hremancibus, post aliguor hebdomadum noctem continuam,
Sol emerterie lupra Horizonrem maturius, quam ex capta
eleratione poli expectassene. Indidem quoque elticitur, ul
Sol in Horizonce consticurus, ec per radium retractum vilus
30 minuTIS, id est rora sui diamerro, allior, quam (Ic re
vera, cum interiori suo limibo videtur Florizoncem tangere,
tocus adhuc lic intra Hlorizontem. Ouinetiam propcer re.
tractionum diminurionem concinuam Fr, ue inferior limbus
Solis paulo plus retractus, quam superior, videatur ad hunc
acrolli; unde Sol oriens vel occidensnon praecise orbicularIs,
Scd eclipucus, oraiare specie appareat, perpendicularem
nempe dimetrum eranlvessa corEraCtiorem labens. QUam