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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 37, page id 1040780814:0055
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_E GEOMETRLCR PLEMENTA.
lum elevatam, magis aut minus pro quantitate Vis Centritura
Sphaeroides haec figura s sore Lelelcopio obterratur: in Terri
(cum hanc cise cempicere non detur) experimentis crincitur.
SCHOLTUM.
DICuE fgura Sphaeroides ex rotatione corporis circa proprium
Axem, e partium Duiditate consequitur; ita vicittim, ex figura ilta
Obetraca ous circa Axem, _ partium Auiditas (saltem olim)
lesitime concluduntur.
eROPOSTTIO LAAI.
Flaenomena orsa d Motu Lelluris Diurno circa Aem, e T et
In pracedentibus ostensum est, qualia forent Phonomena NotIS
Solis ee Planctasu e Tellure visorum, si Tellus esset punctum:
Sol nempe ab occidente in oxientem progredi inter Fixas rideretur;
Planeta vero nunc prosredi, nunc regredi, pro Telluris de Plancta
cujusque litu. Verum cum Tellus corpus sit opacum, Obserratoris
relpectu, latis amplum; ejus Cuperticici (licet sphaerica) pars exisua,
qua (ub rilum prope hanc haerentem sinul venit, in planitiem ex
tendi ridebitur. Cumque oculus undiquaque Calum libere cireum.
spectans risu detiniat superticiem sphaericam caram, Telluri, aut
potius oculo, concentricam; haec in partes duas aequales diridetur à
dicto superticiei Telluris Plano, (quippe per centrum ducto;) quarum
altera visui patet, altera propter Telluris opacitatem latet.
Ouoniam vero Tellus cirea Arem rotatur, huic insictens Specta-
tor, dictumque Planum Puum, hemispharium Caelorum sibi visum
ab inriso disterminans; (quod Forison illi dicitur,) simul in eandem
plasam (nempe orientem) rOtatuE. Inde versus ortum posita, prius
inconspicua, retesuntur, propter ITorixontem intra illa quati (ubs
dentem; ex alia versus occalum resuntur, ITorizonte supra illa clerato.
Ft ideo Spectatori, cui solenne eA Locum tuum pro immoto na-
Bere illa Tupra FToricontem ascendere ridebuntur sre oriri, haec
intra cundem descendere sire occidere: unde e Plagis iltis nomina
Tunt imposica.
Cumque motus Telluris, Timul e huic astiri Spectatoris cujusque
tlorizontis, aquabiliter perpetuo circa cundem Arem de versis
eandem plasam fiat; omnia omnino COrpOra eE Phaenomena, qua
eundem motum non participant, (hoc est, qua a Terra penitus lepa-
rata TunE,) Pari tempore, at versus partes opposicas (ab ortu lc. in
occalum) unitormiter moveri ridebuntur; iis exceptis qua Telluris
Axis productus ofsendie, quae immora apparebunt. Forumque
unumquodque, senfis iudicio, deseribet circumterentiam circuli, cu-
jus plano Telluris Axis, ad contrum, normalis insistit. Ft quoniam
circuli hri omnes, cum visibilibus illos deleribencibus, in cava su-
perticie sphaerica caetelli, Ferra concentrica, apparene; vilibile
quodvis
lure visa, exponere.