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

PHYSICES ELEMENTA inclinatio; augetur in receſſu Lunæ à Nodo; minuitur in
acceſſu ad Nodum.

676.1.

1345.

Angulus enim bp L, minor eſt angulo APL, & eâdem
de causâ continuo minuitur, & inclinatio major fit; ubi autem
Luna ad maximam diſtantiam à plano Eclipticæ pervenit, & ad Nodum oppoſitum accedit, continuò directio motus Lunæ
verſus planum Eclipticæ inflectitur, & minus ad hoc inclina-
tur, quàm ſi in orbitâ motum continuaret: ſit Npn planum
Eclipticæ; curva Nn orbita Lunæ; vi qua Luna continuo
ex hac removetur, mutatur Lunæ via, & percurrit curvam Np,
quæ magis ad Npn in N inclinatur, quàm in p; ita ut pla-
ni orbitæ inclinationem bis mutatam concipere debeamus , dum à Nodo ad Nodum movetur Luna: ideòque quater in ſingulis
Lunæ revolutionibus, bis minuitur, bis iterum augetur.

676.1.

1346.
TAB. XXV .
fig. 6.
1314.
1347.

Poſitis Nodis N, n, in Quadraturis, vires quæ in unicâ re-
volutione augent inclinationem, & hanc minuunt, ſunt æqua-
les inter ſe; nam propter æqualem diſtantiam utriuſque Nodi
à Syzygiis, vires inclinationem mutantes in ND & nE ſunt
æquales viribus, in punctis reſpondentibus, in D n & EN; illis inclinatio augetur, his minuitur ; diminutio anguli inclina- tionis ex primis ſecundarum actione inſtauratur, & hic non
mutatur. In motu memorato lineæ Nodorum reſpectu Solis, qui à ſitu parallelo lineæ hujus pender, Nodus N ad Syzygiam
E fertur. Ubi ex gr. linea Nodorum pervenit ad ſitum Mm,
Luna in receſſu à Nodis tranſit per Quadraturas N, n, in
quibus vis, quæ inclinationem mutat nulla eſt , & in quo- rum viciniis omnium eſt minima : in acceſſu autem ad Nodos ubique Luna à Quadraturis diſtat, & vis major in hanc agit ; ideòque integram conſiderando revolutionem, augmentum
anguli inclinationis ſuperat hujus diminutionem ; id eſt au- getur ille angulus aut quod idem eſt minuitur inclinatio; quod
ubique obtinet in motu Nodorum à Quadraturis ad Syzygias.

676.1.

1348.
TAB. XXV .
fig. 4.
1336.
1345.
1343.
1337.
1336.
1336.
1349.
1345.

Vbi ad Syzygias pervenêre Nodi, inclinatio plani orbi-
tæ eſt omnium minima; nam in motu Nodorum à Syzygiis ad
Quadraturas, magis ac magis continuò inclinatur orbitæ pla-
num; in hoc enim caſu in acceſſu ad Nodum per Quadratu-
ras tranſit Luna, in receſſu ab his diſtat à Quadraturis, & in in-

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