Full text: Gravesande, Willem Jacob: Physices elementa mathematica, experimentis confirmata, sive introductio ad philosophiam Newtonianam

Ortum Solis ſemper præcedit, & occaſum inſequitur, cre-
puſculum; hoc nomine deſignamus lucem illam dubiam, quæ
vulgo Aurora & Veſper vocatur.

664.1.

1149.
1150.

Oriuntur crepuſcula ex Atmoſphærâ, quæ radiis ſolari-
bus illuſtratur, & cujus particulæ lumen quaquaverſum re-
flectunt; unde radii quidam ad nos perveniunt, licèt Sol octo-
decim gradibus infra borizontem deprimatur.

664.1.

1151.

In ſphærâ parallelâ, id eſt, pro omnibus, quæ ſub Æ-
quatore vivunt ; dies & noctes per totum annum ſunt æqua- les inter ſe , nempe duodecim horarum .

664.1.

1152.
1138.
1139.
1144.

In ſphærâ obliquâ dies majores aut minores ſunt, pro va-
riâ diſtantiâ Solis ab Æquatore, verſus unum aut alterum
Polum ; verſus quos ab Æquatore recedit 23. gr. 29. .

664.1.

1153.
1131. 1132.
1087. 1088.

In ipſo Æquatore datur circiter 22. Martis, & 23. Se-
ptembris, & dies nocti æquatur , quod ubique terrarum ob- tinet, ſolis Polis exceptis.

664.1.

1154.
1194.

665. Definitio 20.

1155.

Puncta Eclipticæ, in quibus ab Æquatore ſecatur , vo- cantur Æquinoctialia. Quia in his punctis verſatur Sol ubi
datur æqualitas memorata dierum & noctium.

665.1.

1085.

666. Definitio 21.

Puncta Eclipticæ, in quibus Tropici circulum hunc tan-
gunt , dicuntur Solſtitialia. Quia per aliquot dies, quan- do ad hæc accedit Sol, & ultra tranſit, ſenſibiliter declina-
tionem non mutat, & ſenſibiliter dierum longitudo non va-
riat.

666.1.

1089.

Sub Polis, ſidentur incolæ, ſemel in anno Solem orien-
tem & occidentem obſervant, & dies unicus cum unicâ nocte
integrum annum obſolvunt. Supra horizontem verſatur Sol,
dum dimidiam Eclipticæ partem percurrit , per reliquum Tempus ſub Horizonte latet. Dies tamen protrahitur ex
refractione , & crepuſcula ſunt admodum diuturna, durant enim quamdiu declinatio Solis verſus Polum latentem non
ſuperat 18. gr. .

666.1.

1156.
1085. 1123.
1157.
1113.
1151.

In Polo Arctico in ſex ſignis primis, ab Ariete ad Libram,
Sol ſupra Horizontem verſatur; ideò in hoc Polo dies no-
ctem ſuperat novem diebus naturalibus , præter diminutio- nem noctis ex refractione .

666.1.

1158.
1000.
1157.
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