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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 136, page id 820424455:0158
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ASTRONOMTA.
illuminationis cransear per urumque polum terrae; facile
imaginari pores, ex aequarorem, e omnes ejus parallelos,
mocu cerrae divrno describendos, ab eodem illumination
circulo bilecari, adeoque punctum quodris cerrae conticere
mou diurno unum quidem semicirculum aequarori paralle.
lum in hemisphaerio illuminato, alcerum vero in opaco
hoc est, aequinoctium apparere per univertum terrarum
orbem. Praererea radius a b runc remporis, Ptringie ipsum
requacoris planum, cum perpendicularis Cic axi aequatoris
op. a Duxcunque aurem linea perpendicularis est axi, ea
denque per cemrum terrxe cransi, in aquatore lira ell3
liquidem ipsum xequatorem constimmune; ur ita dicam, innu
merae linex axi perpendiculares ex terrae ceriero undigue
enicantes. Fadem rurtus ereniene, tellure vertance sub li
bed inf. AC sub cancro degente rellure in d, planum illu
minacionis mn pertorarur oblique ab axe op pringente latu
duplicis coni, ideoque eminet:, V. Br. Polus boreus o supra
plarum illumiriationis mn 23 E Braclibus. Id ex Schemale
L.VI. melius disces, quod cum Schemare L. V. ita consenI
uc quod hoc directe oculis objicic. alrerum illud exhribeat d
lacere spectandum, e vicissim. Sic ecliprica, quae Sche
mare. L. V. Specie inceori circuli apparebar, Schemare LV l
projicirur in rectam eo V W, quod de magna ecliprica P3
ricer atque rerrestri accipiendum: Fc rursus, qui Schemale
I. VI. apparebac inceger circulus, nimirum colurus Soll
ciorum  a W, is Schemare L. V. projicirur in rectam eo a n.
Frgo jam Schemare J. VI. dico, cerrae vertancis sub canero
axem op pertorare oblique planum circuli illuminarionis g)
ec polum boreum o eminere supra planum illuminationis 4)
quancirare anguli or. 9 88 Z, Quos pradus men suraE arCUS
g0, qui est porrio coluri solsticiorum g0eo, inter polos
celipriea qee aguatoriso intercepra. Fcenim notaru dignum
est, circulum illuminationis lemper crantire per polos
ectipuicae terrectris, quod liquer ex Schemate IV. ubi
eclipricam cerrectrem sccimus r es nv, ee polum ejus au
Uralem, 1b, c, a, de c. post quem et boreus delicescit, d per
urrum.