Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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erit in caſu aliquo particulari aſtronomice refractionem definire, & </
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liquos calculo ſubducere. </
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<
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fractionem eſſe 5 min. </
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<
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<
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">cui hypotheſi plerique Aſtronomi Pariſiis adhærent.
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<
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altit. ſid. appar. # refract. # altit. ſid. appar. # refract.
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0 grad. # 34 min. # 53 ſec. # 50 grad. # 0 min. # 53 ſec.
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5 # 9 - - - - # 59 - - # 55 # - - - - - # 44 {1/3}
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10 # 5 - - - - # 28 - - # 60 # - - - - - # 36 {1/2}
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15 # 3 - - - - # 44 - - # 65 # - - - - - # 29 {1/2}
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20 # 2 - - - - # 52 - - # 70 # - - - - - # 23
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25 # 2 - - - - # 12 - - # 75 # - - - - - # 17
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30 # 1 - - - - # 47 - - # 80 # - - - - - # 11 {1/4}
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35 # 1 - - - - # 29 - - # 85 # - - - - - - # 5 {1/2}
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40 # 1 - - - - # 15 - - # 90 # - - - - - - # 0.
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45 # 1 - - - - - # 3- -
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">Quia vero @refractiones ſequuntur rationem litteræ g. </
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">id eſt, anguli re-
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fractionis differentialis radii ſub angulo ſemirecto ex aëre naturali in vacuum in-
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cidentis & </
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">quia iſte angulus proportionalis eſt denſitati aëris naturalis, ſeu aëris,
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quem obſervator reſpirat, patet ſi vel aër conſtanter ſimiliter vaporibus eſſet
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oneratus (à quibus animum adhuc abſtraximus) non poſſe tamen fieri, quin
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refractiones aſtronomicæ ſint admodum variabiles. </
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<
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">Majores nempe erunt in
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ſuperficie maris quam in montibus, eritque notabilis differentia vel in me-
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diocribus montium altitudinibus: </
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<
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quam calido, hæcque ſola cauſa in hiſce terris refractiones minimum quarta
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parte augere poteſt: </
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<
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to quam humili. </
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">Poterunt autem ſi vapores nullo ſint obſtaculo, refractiones
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omni tempore recte definiri, ſi inſtrumentum, quod §. </
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quodque Fig. </
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tudinem mercurii in barometro dividas per altitudinem mercurii in altero in-
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ſtrumento, habebis denſitatem aëris, cui cæteris paribus refractio proportio-
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nalis eſt facienda. </
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<
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">Neque dubito, quin refractio ſolis minor ſit refractionibus
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reliquorum ſiderum, quod calor ſolis aërem non mediocriter expandit aëriſ-
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que denſitatem diminuit.</
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